Research How many Pokemon are obtainable in each title?

QuentinQuonce · Sep 9, 2021

This is definitely procrastination from the uni work I need to be doing but let's ignore that.

I've often wondered how many Pokemon in total you can catch in each individual game, without trading or any event add-ons. I became interested in charting it after reading that the box for Pokemon Red and Blue boasts of the amount of Pokemon available in the game, with the number quoted not taking into account matters such as the choice the player has to make between Hitmonchan and Hitmonlee, the two fossil Pokemon, and Eevee's three evolutions. What is the actual number of Pokemon you can obtain in a single playthrough, without obtaining any of these missing Pokemon?

Version-exclusive Pokemon, of course, are the largest factor when it comes to determining the number of Pokemon available in a game. While the amount of version-exclusives are generally balanced between corresponding titles, occasionally they get lopsided and one title ends up with more Pokemon than its twin. Part of me wanted to see if certain titles were better "value for money" in terms of Pokemon obtainable, as this might be a motive for people to choose that title (although likely a retrospective one, as the full extent of this is rarely known until the games are released). I will also be calculating the total number of Pokemon in a game against the total number of Pokemon in its respective generation, to see to how that title stacks up against the total number of Pokemon available at the time.

Bulbapedia's page on the topic of Pokemon by availability is exhaustively thorough, but not the most simple to read, so I figured I'd make a definitive list. For the purposes of this study, this will be written as if all extracurricular methods of obtaining Pokemon - mystery gifts and the like - are to be ignored. Since older games have by and large lost access to the online functions that could be used to obtain bonus items and Pokemon, taking these into account would skew the results. While - for instance - the old WiFi events for gen IV and V are currently still accessible through unofficial servers, it is likely that one day those servers will cease to exist. So let us assume they have. This is to be the case even when it comes to services like Pal Park, which do not require Internet or a second player - imagine that you've only got one Pokemon game. My intention is to write as though I was choosing a single Pokemon game to play, right here and now, with no add-ons or outside help.

With this in mind, I imagine some people will want to debate Pokemon Bank. It is an extra function and Internet-dependent, but it's native to the console the Gen VI and VII must be played on, so it hardly counts as an extra. But I'm sure one day Nintendo will discontinue the service, so for the purposes of this thread I will assume that has happened.

For the sake of clarity, I will be counting the number of Pokemon obtainable, not accessible. So, for instance, there are nine starter Pokemon per game - but as typically only three are accessible without trading, that will just count as three no matter what. The fact that you can obtain the full set of starters is irrelevant - without trading or glitches, you cannot transfer your starter from one save file to another. For this reason, trade evo Pokemon are generally considered inaccessible since they're typically not obtainable without trading with another copy, but I will make note of where these Pokemon can be caught in the wild.

Glitches will be ignored.

Lastly - my maths is not the greatest, but to the best of my knowledge these figures are correct, or as good as. If I'm out on any of them, please be polite if you wish to correct me.

So, let's get stuck in.

Gen I

Note that I'll be referring to Red and Blue as the original pair, with Green as the Japanese extra version.

Red: 124 (82.11%)
Blue: 124 (82.11%)
Green: 126 (83.44%)
Yellow: 129 (85.43%)

Notes
Unsurprisingly, the first generation is a fairly simple matter. With 151 Pokemon in the game in total, only 124 Pokemon can be obtained in one solo playthrough in Pokemon Red and Blue. 11 Pokemon are exclusive to each game, bringing the initial number down to 140; six of the starter Pokemon are made inaccessible when the player makes their choice; they must also must forfeit one fossil (thus losing two Dex entries) and one Hitmon. The four Pokemon which evolve only by trade - Alakazam, Golem, Gengar, and Machamp - cannot be obtained in a solo playthrough. (EDIT: The Japanese Pokemon Green gives access to Gengar and Golem via in-game trades, while the Western RB has no in-game trades of this nature.) Eevee can evolve three different ways, but the player only gets one. Finally, Mew is not encounterable in regular gameplay. With 27 Pokemon missing or otherwise inaccessible, that leaves only 124 that can be obtained.

Unsurprisingly, Yellow gives access to slightly more Pokemon than other titles. It unexpectedly has slightly more version-exclusive missing Pokemon than the others, but the ability to get all nine starter Pokemon (as well as Machamp via an in-game trade) makes up for this. It's not much, but it's just enough to make it the winner.

Best value for money: Yellow

Gen II

Gold: 199 79.28%
Silver: 198 78.88%
Crystal: 207 82.47%

Notes
251 Pokemon available in all.

Though the fact that the percentages barely change from Gen I makes it seem otherwise, Gold, Silver, and Crystal actually have a comparatively large amount of absent Pokemon. The absent first gen starters, fossils, and legendaries add up to 18 (Aerodactyl, of course, is obtainable in-game via an in-game trade) while the starters not chosen by the player add six more. Gen II adds a rather weighty six Pokemon to the pool of those which evolve by trade (the most of any generation), leaving ten Pokemon completely inaccessible to solo players. That leaves us with 34 missing Pokemon on top of the version-exclusives.

Like Mew, Celebi is missing in these games, but not in Crystal VC. Of course, in the original cartridge version it is absent. Interestingly, without the VC event Crystal and Silver are identical. When weighing Crystal against other upper versions such as Yellow, Emerald, and Platinum, it's surprising that it didn't add any additional Pokemon - not the Kanto starters, fossils, or even the legendary birds. However, with Celebi included, it still squeaks over the line to be the winner, making this the only generation where all three games have exactly the same amount of Pokemon available (in the original release, at least)!

A very belated edit thanks to something highlighted by Altissimo: in GS, the player can only get one each of the Fire, Water, Thunder, and Leaf Stones, meaning that only one of their respective stone evolutions is available to the player without interacting with another file.

Fire: Arcanine OR Flareon OR Ninetales (in Silver only)
Water: Cloyster OR Poliwrath OR Starmie OR Vaporeon
Thunder: Raichu OR Jolteon
Leaf: Vileplume OR Victreebel OR Exeggutor

So knock off one for Fire in Gold, and two in Silver, three for Water, one for Thunder, and two for Leaf for a total of 7 in Gold and 8 in Silver. Hey, look at that! Gold ends up slightly ahead. Crystal, of course, makes the evolution stones repeatedly obtainable so has no such restriction.

Best value for money: Crystal (VC)

Gen III

Ruby: 177 45.85%
Sapphire: 178 46.11%
Emerald: 213 55.18%

Notes
We enter Gen III and instantly there's a steep drop-off in the percentage of available Pokemon. This is thanks to Gen III's proto-Dexit, which did away with 184 missing older-generation Pokemon. We get 135 new ones, though, giving us 386 overall.

Six missing starters and a choice of fossils mean we're short a further 8 Pokemon from our remaining lot. A further eight version-exclusive Pokemon for each title cut our numbers further, but we're not done yet! Two unobtainable mythicals shave the roster a little more.

Gen III has three of the trade-evolving mons from Kanto (Gengar is absent along with the rest of its family) and just one of the Johto ones (Kingdra) as well as adding two more (Huntail and Gorebyss). Fewer than GSC but a lot more than RBGY had. Overall, both Ruby and Sapphire have a maximum of 178 Pokemon obtainable in either title without trading, events, or other interference.

Emerald is missing seven Pokemon instead of eight, and helpfully bolsters its ranks with a large selection of Safari Zone mons as well as Meowth and Persian. It also allows for both sets of fossils, giving it a grand total of 214 Pokemon available without outside interference. Numerically, Emerald has the most Pokemon available of any game so far, but it still only amounts to a rather pitiful 55.44%.

EDIT: Thanks to DrPumpkinz for another useful correction. In Ruby and Emerald, there is only one Moon Stone available but two Pokemon (Skitty and Jigglypuff) need it to evolve, meaning that the player can only have one without trading. Wild Lunatone have a small chance of holding a Moon Stone, but those are exclusive to Sapphire, meaning that Sapphire nudges ahead to be slightly better value than Ruby.

Best value for money: Emerald. You're shocked, right?

FireRed: 171 44.3%
LeafGreen: 172 44.55%

Notes
Would you believe these were two of the hardest games to verify numbers for?

FRLG significantly up the ante on version-exclusive mons, divvying up many more than their ancestor titles did. FireRed has 23 missing Pokemon while LeafGreen has 22. These diminished rosters are bolstered by the smattering of Johto Pokemon available. As ever, there's a choice of fossils, but the ability to breed now means that the Hitmon and Eevee choices aren't as final as they seem. This is countermanded by Espeon and Umbreon being inaccessible, though. Thanks to not having any of the Hoenn squad bar Wynaut and Azurill, FRLG come out as the worst percentage-wise so far.

Better value for money: LeafGreen barely edges out FireRed as the better value for money, having just one more Pokemon. Unfortunately that Pokemon is Azurill so it's not much of a win.

Overall best value for money in Gen III: It's still Emerald. No contest.

Bonus round - GameCube

Yeah, why not? This won't take a minute.

Colosseum: 63 16.32%

The easiest entry on this list for sure. 52 Pokemon are obtainable in total including the prize Ho-Oh; 11 of the Shadow Pokemon caught can evolve, and all are capable of doing so just once, for a total of 63 Pokemon available overall. This gives an utterly tragic percentage of 16.32%, though it goes without saying that Pokedex completion is not what this game is concerned with. It only has 90 box spaces for god's sake.

XD: 153 39.63%

Much better. 83 Shadow Pokemon, of which there are 37 new forms achieved by evolution. Adding Elekid and all the potential Pokespot Pokemon gives you 15 more, while the Johto starters and Duking's trades allow access to another 15. Finally, Eevee and whatever evolution the player chooses means that players of XD can obtain a maximum of 153 Pokemon obtainable in one playthrough. While not superb, 39.63% looks splendid compared to Colosseum.

Gen IV

Diamond: 361 73.22%
Pearl: 358 72.61%
Platinum: 371 75.25%

Notes
We enter Gen IV, with a beefed-up 493 Pokemon available to us. All the usual caveats apply. Starters, choice of fossil - except here the fossil choice isn't actually a choice, since it's based on the game version instead of a decision. Sinnoh adds 5 new trade evolution-exclusive Pokemon; all of them and the older ones are, as ever, inaccessible - except for Steelix, who's finally catchable.

Due to Diamond and Pearl famously including every single Pokemon except previous-gen starters, legends, and bizarrely Tropius and Tangela (and by extension Tangrowth), they should by rights be closer to 100% than any other game. But the number of legends, mythicals, and starters from past generations has gotten large enough to keep it at around 80%. Besides this, there are 19 Pokemon missing from both Diamond and Pearl but, due to the seeming randomness of the missing Pokemon, Diamond ends up knocking Pearl for six... well, maybe three... by having a slightly higher number of Pokemon obtainable - 398 to Pearl's 395.

EDIT: Thanks to DrPumpkinz for the reminder - subtracting the dongle Pokemon lowers the numbers further - subtract six for Ruby, six for Sapphire, nine for FireRed, nine for LeafGreen, and seven for Emerald, giving us 361 for Diamond and 358 for Pearl. For Platinum, subtract six for Ruby, six for Sapphire, seven for FireRed, seven for LeafGreen, and five for Emerald.

Platinum is missing 12, but adds the three legendary birds and allows capture of both mascot legends, so comes in at a respectable 371.

Meanwhile the inability to get Regice, Registeel, and Regirock without transferring means that Regigigas is frozen as a statue forever. So sad.

Best value for money: Very obviously Platinum.

HeartGold: 377 76.47%
SoulSilver: 375 76.05%

Notes
Uneven version-exclusives again. HG has 19 missing Pokemon while SS has 21, edging forward HG as the winner.

The usual complement of trade evos, missing legends and starters from older games, and inaccessible unchosen starters are in force. Unfortunately most of HGSS's best mons are event- or Pokewalker-exclusive, so that's a shame.

Best value for money: HeartGold, just.

Overall best value for money in Gen IV: Thanks to the edit above, Platinum drops sharply, leaving HeartGold as the best overall title in Gen IV.

Gen V

Black: 414 63.79%
White: 414 63.79%

Notes
Another soft reboot means a huge amount of older Pokemon (185, to be exact) get left in the past, while 156 new ones give us a new grand total of 649. Both games lack 19 Pokemon from the other title. The usual fossil choice is in play, depriving the player of two Dex entries, as is the usual starter choice. Four mythicals also cannot be found anywhere in Unova.

Shockingly, BW let the player catch some of the Pokemon formerly restricted to evolving by trade. Slowking, Kingdra, and Politoed can all be fished up as well as either Huntail or Gorebyss depending on version. The game compensates by making Milotic a trade-evolving Pokemon now, as well as adding four new Pokemon which only evolve by trade.

Pokemon White's fantastic range of Pokemon available to catch in White Forest had the potential to make these titles the most lopsided in history, with a potential 100 extra Pokemon obtainable. Unfortunately, these rely on other games to procure, thus cannot be relied upon.

Best value for money: No difference, though as mentioned White has the potential for vastly more Pokemon.

B2: 436 67.18%
W2: 433 66.71%

Notes
Despite being lauded for bringing back many older Pokemon, in terms of numbers the amount of missing Pokemon (167) is not far removed from BW's. The same principles apply, but this time Alakazam and Gigalith can be obtained without needing to trade with another human being

Uniquely, B2W2 are the only games where the player's gender can affect what Pokemon they get. Yancy and Curtis' trades yield three different Pokemon apiece, none of which are available elsewhere; girls get Mankey, Cranidos, and Phanpy, while boys get Meowth, Shieldon, and Teddiursa (and all the attendant evolutions). Thanks to having 20 version exclusives to White 2's 17, Black 2 manages to edge out White 2, with 3 more species available.

Best value for money: Black 2, though there's not much in it.

Overall best value for money in Gen V: Black 2, again.

Gen VI

X: 557 77.25% or 418 57.97%
Y: 557 77.25% or 418 57.97%

Notes
Total parity is the story of the day as we enter Gen VI, and 721 Pokemon in total. Both games have the same amount of exclusives (18) and the same overall number of Pokemon.

For once, the usual formulas do not apply. The player gets a starter, but they can get a second Kalos starter after beating the Elite 4. For the first time the player can only get one of the birds. The usual starter formula applies to the intruding Kanto trio, though, and the fossils, as ever.

Trade-exclusive mons get interesting in these games; thanks to an in-game trade, Steelix is obtainable, and Politoed can be caught wild. One of Clamperl's evos can be caught, too. Milotic is still trade-exclusive, though. Bizarrely, though Trevenant was introduced in this generation, the game doesn't seem bothered about doing things the right way; it's catchable wild. The other three trade-exclusive mons introduced in XY are not.

The Friend Safari makes this interesting. After all, it's part of the game and not a bonus feature. On the other hand, it requires additional consoles to make it work. I'm in two minds. If it is included, XY potentially have 557 Pokemon obtainable. If not, it's just 418 per game.

Best value for money: no appreciable difference.

Omega Ruby: 421 58.39%
Alpha Sapphire: 421 58.39%

Notes
Just barely more than XY has sans Friend Safari. 21 missing from each game.

For the first time in a while, no trade evolution mons (except Milotic) can be obtained wild. This is the only game since its introduction where Trevenant cannot be caught without actually evolving it how it's supposed to be evolved. Really curious. Our first mythical available in-game, too. That's cool.

Best value for money: no appreciable difference.

Best value for money in Gen VI: It's a tough one. The fact that ORAS permits access to the Mega Stones more readily than XY might tip the balance, despite these only being forms and not discrete species in their own right. But in terms of potential availability XY win out.

Gen VII

Sun: 353 44.04%
Moon: 353 44.04%

Notes
Absolutely dismal numbers, just narrowly beating FRLG to be the series' worst showing. Hardly fitting for the 20th anniversary games as the series reaches 802 Pokemon.

There are just 15 version exclusives between the two games. No fossils here, though. Two of the original trade evo mons - Golem and Gengar - are available without trading. Slowking and Politoed are catchable, while Conkeldurr and Trevenant are also available wild.

Magearna is a curiosity. On the one hand, it does involve a code not found in the game natively. On the other hand, it's available indefinitely, and requires zero effort. On balance, it's in. The same goes for Island Scan mons, since any QR code can be used to charge up the scanner.

Best value for money: no appreciable difference.

US: 550 68.57%
UM: 550 68.57%

Notes
Much improved. USUM rounds up to 550 mons available as the games expand to 807 Pokemon available overall. Golem is no longer obtainable in-game, but both Gorebyss and Huntail are catchable in one game for the first time. Gengar, Politoed, Slowking, and Trevenant remain catchable. Thanks to the onslaught of legends available, there are a whopping 28 version exclusives.

Best value for money: No appreciable difference

Overall best value for money in Gen VII: Either of the Ultra versions.

Gen VIII

Sword 364 40.89% or 364 83.67%
Shield 364 40.89% or 364 83.67%

Notes
A quite unique case here, and a potential endless debate. If you believe that all the Dexited Pokemon still count, it's an absolutely miserable showing - just 40.89% of all Pokemon, one of the worst in the series. If you consider only the Pokemon coded into the base game, then it's a far better picture - 83.67% of all the Pokemon, one of the best in the series.

Whatever the case, SwSh have the largest amount of version-exclusives in the series - 30. But while the starters are still a choice, everything else is tossed out. You can get all four fossil mons. All trade evo mons are now capturable in the Wild Area - and let's assume at some point online access for the Switch gets disabled. They'd still all be capturable without it.

The IoA expansion adds 110 Pokemon, of which 6 are exclusive to either Sword or Shield. A further nine are inaccessible - Porygon2 and PorygonZ remain trade-exclusive, while only one Alola starter can be chosen and Zarude, of course, is event-exclusive. So 95 are accessible.

CT adds 74 Pokemon, of which 13 are exclusive to either game and two - the Regi and Calyrex's steed - become inaccessible once their counterpart is chosen, meaning you get 59 overall. There's no version difference, though.

Best value for money: no appreciable difference.

So, which is the best and which is the worst title when it comes to Pokemon content and value for money?

Going by percentages, amusingly Pokemon Yellow of all games is statistically the best title. It has the most Pokemon available relative to the maximum (admittedly not hard to do when it's the first generation) and has more species available proportionally than any other game in the series.

If we choose to ignore Colosseum and XD as outliers (I included them for the sake of interest, but I don't think they can be judged on the same criteria as the rest of the series) then the original Sun and Moon are statistically the worst games. Ironic, especially considering FireRed narrowly misses out on the bottom rung.

Some surprises, some revelations, and some serious number-crunching. I hope you found this interesting, and thanks for reading if you made it this far.

DrPumpkinz · Sep 9, 2021

Do the Gen 4 numbers take into account Pokemon that don't technically need to be transferred but are still locked behind additional carts via dual slot mode?

CTNC · Sep 9, 2021

Interesting read. I'm guessing new evolutions and prevolutions messed with the balance of FR/LG and HG/SS, but why are G/S and D/P imbalanced? Are the numbers at least equal if you go by total Evolution Chains instead of total Pokemon.

Even without other players, White Forest will have a few Pokemon (not sure if it's 2 or 3 or some other number of people minimum) so that alone gives White the biggest imbalance of any paired games. Judging by Serebii, and assuming two people is the minimum you can have, even the worst pairs of people (Porygon/Wooper and a 3 Stage that also gives Wooper, Lotad/Surskit with a Trade Evolution Pokemon that also gives Lotad or Surskit, or Two Trade Evos that share a 2 Stage Water Pokemon) give a 6 Pokemon advantage, easily enough to beat D/P's 3 Pokemon gap and G/S's 2.2% gap. The best odds of Wurmple/Surskit and either Nido, (They both have 2 Stage Waters that aren't Surskit.) would bring that imbalance to 15!
Disclaimer: I'm basing that off of what I've seen in Black City because I have black instead of White, so take what I said with a grain of salt and correct me if I'm wrong.

DrPumpkinz said:
Do the Gen 4 numbers take into account Pokemon that don't technically need to be transferred but are still locked behind additional carts via dual slot mode?

Hmm... Dual slot mode made me wonder, which game gives the best value as far as dual slot goes? I doubet it matters because it only lets you catch Pokemon you could catch and transfer from the GBA game, but I wonder about things that don't matter a lot.

QuentinQuonce · Sep 10, 2021

DrPumpkinz said:
Do the Gen 4 numbers take into account Pokemon that don't technically need to be transferred but are still locked behind additional carts via dual slot mode?

My bad, they don't! I'm not sure how I missed that, when I specifically left out Gengar because it requires the dongle method. I've edited the calculation above - this actually pushes HeartGold up the ranking to (narrowly) be the best option in Gen IV.

CTNC said:
Interesting read. I'm guessing new evolutions and prevolutions messed with the balance of FR/LG and HG/SS, but why are G/S and D/P imbalanced? Are the numbers at least equal if you go by total Evolution Chains instead of total Pokemon.

Hmmm. Looking back at the numbers, I may have miscounted - there's an equal number of mons missing from G/S and D/P, so not sure where the imbalance came from. It's confused a bit by the fact that Slowking is nominally exclusive to Pearl and Scizor to Diamond, though of course neither Pokemon can actually be obtained in either game. I think the lopsidedness may have come from the Slowpoke line apparently being a counterpart to Seel (which is exclusive to Diamond) but having three members of the line rather than the Seel line's two, making it look distorted.

HG/SS, though, do still have a lopsided set of exclusives, due to Gligar and Mantine gaining evolutionary relatives.

CTNC said:
Even without other players, White Forest will have a few Pokemon (not sure if it's 2 or 3 or some other number of people minimum) so that alone gives White the biggest imbalance of any paired games. Judging by Serebii, and assuming two people is the minimum you can have, even the worst pairs of people (Porygon/Wooper and a 3 Stage that also gives Wooper, Lotad/Surskit with a Trade Evolution Pokemon that also gives Lotad or Surskit, or Two Trade Evos that share a 2 Stage Water Pokemon) give a 6 Pokemon advantage, easily enough to beat D/P's 3 Pokemon gap and G/S's 2.2% gap. The best odds of Wurmple/Surskit and either Nido, (They both have 2 Stage Waters that aren't Surskit.) would bring that imbalance to 15!
Disclaimer: I'm basing that off of what I've seen in Black City because I have black instead of White, so take what I said with a grain of salt and correct me if I'm wrong.

I played Black as well so I'm not 100% and Bulbapedia's article is quite ambiguously worded, but I believe you're right about White Forest. I didn't include any Pokemon as the randomness of what you get means that it's an open question, but it does push White very slightly ahead - even if you get, say, Porygon, it's still one Pokemon more than Black.

CTNC said:
Hmm... Dual slot mode made me wonder, which game gives the best value as far as dual slot goes? I doubet it matters because it only lets you catch Pokemon you could catch and transfer from the GBA game, but I wonder about things that don't matter a lot.

FireRed and LeafGreen both give access to nine Pokemon in DP, but the Elekid and Magby lines are available natively in Platinum. But they also allow Gengar to be captured in the Old Chateau (as well as allowing the player to catch super low-levelled Staravia and Bibarel at Lake Verity for some reason).

mertyville · Sep 10, 2021

Is Eevee's incapability to evolve into Espeon and Umbreon included for FRLG?

QuentinQuonce · Sep 10, 2021

mertyville said:
Is Eevee's incapability to evolve into Espeon and Umbreon included for FRLG?

Yep. FRLG was probably the most difficult entry on the list due to me not knowing which Johto Pokemon did or didn't appear. I always think of it as being "the ones not in the Emerald Safari Zone" but there's some overlap, like Wooper being in both FR, Emerald, and Colosseum, and Chinchou only being in RSE.

Esserise · Sep 10, 2021

Really great work. Just want to say that Machamp is actually available in Yellow through an in-game trade, so I believe Yellow's total should be 129. (And, while you weren't counting Japanese Blue, I'll go ahead and confirm that it's basically the same as RGB overall, except that in-game trades grant access to Golem and Gengar, for a total of 126 Pokémon available.)

Also, one question: Which two Pokémon is Gold missing that Silver and Crystal aren't? I might be missing something obvious but I've been scratching my head over that one for a bit.

DrPumpkinz · Sep 11, 2021

Oh, something else that you may or may not have already taken into account: in Ruby and Emerald, there is only a single Moon Stone, so you can only get one of Wigglytuff and Delcatty. Sapphire has no such issue, because the only thing the Sun Stone is for is Bellossom.

QuentinQuonce · Sep 11, 2021

DrPumpkinz said:
Oh, something else that you may or may not have already taken into account: in Ruby and Emerald, there is only a single Moon Stone, so you can only get one of Wigglytuff and Delcatty. Sapphire has no such issue, because the only thing the Sun Stone is for is Bellossom.

I did not know this, good catch! Thanks.

QuentinQuonce · Sep 11, 2021

Esserise said:
Really great work. Just want to say that Machamp is actually available in Yellow through an in-game trade, so I believe Yellow's total should be 129. (And, while you weren't counting Japanese Blue, I'll go ahead and confirm that it's basically the same as RGB overall, except that in-game trades grant access to Golem and Gengar, for a total of 126 Pokémon available.)

Also, one question: Which two Pokémon is Gold missing that Silver and Crystal aren't? I might be missing something obvious but I've been scratching my head over that one for a bit.

Machamp is included in the count for Yellow, I probably should have mentioned that in its section. I am counting Japanese Blue (I'm calling it Green because that's what I know it as) so I've edited that section.

I think I must have made a mistake with GS because looking back over the notes I made I'm not sure how I came to those numbers. Gonna edit that section too, I think. That actually means that GSC are the first (and only) trio of games where the total number of Pokemon obtainable is the same in all versions, barring the VC release.

Addri Trainer · Jan 9, 2022

Besides this, there are 19 Pokemon missing from both Diamond and Pearl but, due to the seeming randomness of the missing Pokemon, Diamond ends up knocking Pearl for six... well, maybe three...

I do not understand this phrase. Maybe the 19 you are talking about they are the exclusives? And why Diamond beats Pearl? I mean, which of them? I have a bit of confusion with this gen specifically :/

Zilche · Dec 28, 2022

green_typhlosion said:
This is definitely procrastination from the uni work I need to be doing but let's ignore that.

I've often wondered how many Pokemon in total you can catch in each individual game, without trading or any event add-ons. I became interested in charting it after reading that the box for Pokemon Red and Blue boasts of the amount of Pokemon available in the game, with the number quoted not taking into account matters such as the choice the player has to make between Hitmonchan and Hitmonlee, the two fossil Pokemon, and Eevee's three evolutions. What is the actual number of Pokemon you can obtain in a single playthrough, without obtaining any of these missing Pokemon?

Version-exclusive Pokemon, of course, are the largest factor when it comes to determining the number of Pokemon available in a game. While the amount of version-exclusives are generally balanced between corresponding titles, occasionally they get lopsided and one title ends up with more Pokemon than its twin. Part of me wanted to see if certain titles were better "value for money" in terms of Pokemon obtainable, as this might be a motive for people to choose that title (although likely a retrospective one, as the full extent of this is rarely known until the games are released). I will also be calculating the total number of Pokemon in a game against the total number of Pokemon in its respective generation, to see to how that title stacks up against the total number of Pokemon available at the time.

Bulbapedia's page on the topic of Pokemon by availability is exhaustively thorough, but not the most simple to read, so I figured I'd make a definitive list. For the purposes of this study, this will be written as if all extracurricular methods of obtaining Pokemon - mystery gifts and the like - are to be ignored. Since older games have by and large lost access to the online functions that could be used to obtain bonus items and Pokemon, taking these into account would skew the results. While - for instance - the old WiFi events for gen IV and V are currently still accessible through unofficial servers, it is likely that one day those servers will cease to exist. So let us assume they have. This is to be the case even when it comes to services like Pal Park, which do not require Internet or a second player - imagine that you've only got one Pokemon game. My intention is to write as though I was choosing a single Pokemon game to play, right here and now, with no add-ons or outside help.

With this in mind, I imagine some people will want to debate Pokemon Bank. It is an extra function and Internet-dependent, but it's native to the console the Gen VI and VII must be played on, so it hardly counts as an extra. But I'm sure one day Nintendo will discontinue the service, so for the purposes of this thread I will assume that has happened.

For the sake of clarity, I will be counting the number of Pokemon obtainable, not accessible. So, for instance, there are nine starter Pokemon per game - but as typically only three are accessible without trading, that will just count as three no matter what. The fact that you can obtain the full set of starters is irrelevant - without trading or glitches, you cannot transfer your starter from one save file to another. For this reason, trade evo Pokemon are generally considered inaccessible since they're typically not obtainable without trading with another copy, but I will make note of where these Pokemon can be caught in the wild.

Glitches will be ignored.

Lastly - my maths is not the greatest, but to the best of my knowledge these figures are correct, or as good as. If I'm out on any of them, please be polite if you wish to correct me.

So, let's get stuck in.

Gen I

Note that I'll be referring to Red and Blue as the original pair, with Green as the Japanese extra version.

View attachment 371148 View attachment 371149

Red: 124 (82.11%)
Blue: 124 (82.11%)
Green: 126 (83.44%)
Yellow: 129 (85.43%)

Notes
Unsurprisingly, the first generation is a fairly simple matter. With 151 Pokemon in the game in total, only 124 Pokemon can be obtained in one solo playthrough in Pokemon Red and Blue. 11 Pokemon are exclusive to each game, bringing the initial number down to 140; six of the starter Pokemon are made inaccessible when the player makes their choice; they must also must forfeit one fossil (thus losing two Dex entries) and one Hitmon. The four Pokemon which evolve only by trade - Alakazam, Golem, Gengar, and Machamp - cannot be obtained in a solo playthrough. (EDIT: The Japanese Pokemon Green gives access to Gengar and Golem via in-game trades, while the Western RB has no in-game trades of this nature.) Eevee can evolve three different ways, but the player only gets one. Finally, Mew is not encounterable in regular gameplay. With 27 Pokemon missing or otherwise inaccessible, that leaves only 124 that can be obtained.

Unsurprisingly, Yellow gives access to slightly more Pokemon than other titles. It unexpectedly has slightly more version-exclusive missing Pokemon than the others, but the ability to get all nine starter Pokemon (as well as Machamp via an in-game trade) makes up for this. It's not much, but it's just enough to make it the winner.

Best value for money: Yellow

Gen II

View attachment 371093 View attachment 371094 View attachment 371095

Gold: 206 82.07%
Silver: 206 82.07%
Crystal: 207 82.47%

Notes
251 Pokemon available in all.

Though the fact that the percentages barely change from Gen I makes it seem otherwise, Gold, Silver, and Crystal actually have a comparatively large amount of absent Pokemon. The absent first gen starters, fossils, and legendaries add up to 18 (Aerodactyl, of course, is obtainable in-game via an in-game trade) while the starters not chosen by the player add six more. Gen II adds a rather weighty six Pokemon to the pool of those which evolve by trade (the most of any generation), leaving ten Pokemon completely inaccessible to solo players. That leaves us with 34 missing Pokemon on top of the version-exclusives.

Like Mew, Celebi is missing in these games, but not in Crystal VC. Of course, in the original cartridge version it is absent. Interestingly, without the VC event Crystal and Silver are identical. When weighing Crystal against other upper versions such as Yellow, Emerald, and Platinum, it's surprising that it didn't add any additional Pokemon - not the Kanto starters, fossils, or even the legendary birds. However, with Celebi included, it still squeaks over the line to be the winner, making this the only generation where all three games have exactly the same amount of Pokemon available (in the original release, at least)!

Best value for money: Crystal (VC)

Gen III

View attachment 371097 View attachment 371098 View attachment 371099

Ruby: 177 45.85%
Sapphire: 178 46.11%
Emerald: 213 55.18%

Notes
We enter Gen III and instantly there's a steep drop-off in the percentage of available Pokemon. This is thanks to Gen III's proto-Dexit, which did away with 184 missing older-generation Pokemon. We get 135 new ones, though, giving us 386 overall.

Six missing starters and a choice of fossils mean we're short a further 8 Pokemon from our remaining lot. A further eight version-exclusive Pokemon for each title cut our numbers further, but we're not done yet! Two unobtainable mythicals shave the roster a little more.

Gen III has three of the trade-evolving mons from Kanto (Gengar is absent along with the rest of its family) and just one of the Johto ones (Kingdra) as well as adding two more (Huntail and Gorebyss). Fewer than GSC but a lot more than RBGY had. Overall, both Ruby and Sapphire have a maximum of 178 Pokemon obtainable in either title without trading, events, or other interference.

Emerald is missing seven Pokemon instead of eight, and helpfully bolsters its ranks with a large selection of Safari Zone mons as well as Meowth and Persian. It also allows for both sets of fossils, giving it a grand total of 214 Pokemon available without outside interference. Numerically, Emerald has the most Pokemon available of any game so far, but it still only amounts to a rather pitiful 55.44%.

EDIT: Thanks to DrPumpkinz for another useful correction. In Ruby and Emerald, there is only one Moon Stone available but two Pokemon (Skitty and Jigglypuff) need it to evolve, meaning that the player can only have one without trading. Wild Lunatone have a small chance of holding a Moon Stone, but those are exclusive to Sapphire, meaning that Sapphire nudges ahead to be slightly better value than Ruby.

Best value for money: Emerald. You're shocked, right?

View attachment 371104 View attachment 371102

FireRed: 171 44.3%
LeafGreen: 172 44.55%

Notes
Would you believe these were two of the hardest games to verify numbers for?

FRLG significantly up the ante on version-exclusive mons, divvying up many more than their ancestor titles did. FireRed has 23 missing Pokemon while LeafGreen has 22. These diminished rosters are bolstered by the smattering of Johto Pokemon available. As ever, there's a choice of fossils, but the ability to breed now means that the Hitmon and Eevee choices aren't as final as they seem. This is countermanded by Espeon and Umbreon being inaccessible, though. Thanks to not having any of the Hoenn squad bar Wynaut and Azurill, FRLG come out as the worst percentage-wise so far.

Better value for money: LeafGreen barely edges out FireRed as the better value for money, having just one more Pokemon. Unfortunately that Pokemon is Azurill so it's not much of a win.

Overall best value for money in Gen III: It's still Emerald. No contest.

Bonus round - GameCube

Yeah, why not? This won't take a minute.

View attachment 371105

Colosseum: 63 16.32%

The easiest entry on this list for sure. 52 Pokemon are obtainable in total including the prize Ho-Oh; 11 of the Shadow Pokemon caught can evolve, and all are capable of doing so just once, for a total of 63 Pokemon available overall. This gives an utterly tragic percentage of 16.32%, though it goes without saying that Pokedex completion is not what this game is concerned with. It only has 90 box spaces for god's sake.

View attachment 371106

XD: 153 39.63%

Much better. 83 Shadow Pokemon, of which there are 37 new forms achieved by evolution. Adding Elekid and all the potential Pokespot Pokemon gives you 15 more, while the Johto starters and Duking's trades allow access to another 15. Finally, Eevee and whatever evolution the player chooses means that players of XD can obtain a maximum of 153 Pokemon obtainable in one playthrough. While not superb, 39.63% looks splendid compared to Colosseum.

Gen IV

View attachment 371108 View attachment 371109 View attachment 371111

Diamond: 361 73.22%
Pearl: 358 72.61%
Platinum: 371 75.25%

Notes
We enter Gen IV, with a beefed-up 493 Pokemon available to us. All the usual caveats apply. Starters, choice of fossil - except here the fossil choice isn't actually a choice, since it's based on the game version instead of a decision. Sinnoh adds 5 new trade evolution-exclusive Pokemon; all of them and the older ones are, as ever, inaccessible - except for Steelix, who's finally catchable.

Due to Diamond and Pearl famously including every single Pokemon except previous-gen starters, legends, and bizarrely Tropius and Tangela (and by extension Tangrowth), they should by rights be closer to 100% than any other game. But the number of legends, mythicals, and starters from past generations has gotten large enough to keep it at around 80%. Besides this, there are 19 Pokemon missing from both Diamond and Pearl but, due to the seeming randomness of the missing Pokemon, Diamond ends up knocking Pearl for six... well, maybe three... by having a slightly higher number of Pokemon obtainable - 398 to Pearl's 395.

EDIT: Thanks to DrPumpkinz for the reminder - subtracting the dongle Pokemon lowers the numbers further - subtract six for Ruby, six for Sapphire, nine for FireRed, nine for LeafGreen, and seven for Emerald, giving us 361 for Diamond and 358 for Pearl. For Platinum, subtract six for Ruby, six for Sapphire, seven for FireRed, seven for LeafGreen, and five for Emerald.

Platinum is missing 12, but adds the three legendary birds and allows capture of both mascot legends, so comes in at a respectable 371.

Meanwhile the inability to get Regice, Registeel, and Regirock without transferring means that Regigigas is frozen as a statue forever. So sad.

Best value for money: Very obviously Platinum.

View attachment 371113 View attachment 371115

HeartGold: 377 76.47%
SoulSilver: 375 76.05%

Notes
Uneven version-exclusives again. HG has 19 missing Pokemon while SS has 21, edging forward HG as the winner.

The usual complement of trade evos, missing legends and starters from older games, and inaccessible unchosen starters are in force. Unfortunately most of HGSS's best mons are event- or Pokewalker-exclusive, so that's a shame.

Best value for money: HeartGold, just.

Overall best value for money in Gen IV: Thanks to the edit above, Platinum drops sharply, leaving HeartGold as the best overall title in Gen IV.

Gen V

View attachment 371121 View attachment 371122

Black: 414 63.79%
White: 414 63.79%

Notes
Another soft reboot means a huge amount of older Pokemon (185, to be exact) get left in the past, while 156 new ones give us a new grand total of 649. Both games lack 19 Pokemon from the other title. The usual fossil choice is in play, depriving the player of two Dex entries, as is the usual starter choice. Four mythicals also cannot be found anywhere in Unova.

Shockingly, BW let the player catch some of the Pokemon formerly restricted to evolving by trade. Slowking, Kingdra, and Politoed can all be fished up as well as either Huntail or Gorebyss depending on version. The game compensates by making Milotic a trade-evolving Pokemon now, as well as adding four new Pokemon which only evolve by trade.

Pokemon White's fantastic range of Pokemon available to catch in White Forest had the potential to make these titles the most lopsided in history, with a potential 100 extra Pokemon obtainable. Unfortunately, these rely on other games to procure, thus cannot be relied upon.

Best value for money: No difference, though as mentioned White has the potential for vastly more Pokemon.

View attachment 371128 View attachment 371127

B2: 436 67.18%
W2: 433 66.71%

Notes
Despite being lauded for bringing back many older Pokemon, in terms of numbers the amount of missing Pokemon (167) is not far removed from BW's. The same principles apply, but this time Alakazam and Gigalith can be obtained without needing to trade with another human being

Uniquely, B2W2 are the only games where the player's gender can affect what Pokemon they get. Yancy and Curtis' trades yield three different Pokemon apiece, none of which are available elsewhere; girls get Mankey, Cranidos, and Phanpy, while boys get Meowth, Shieldon, and Teddiursa (and all the attendant evolutions). Thanks to having 20 version exclusives to White 2's 17, Black 2 manages to edge out White 2, with 3 more species available.

Best value for money: Black 2, though there's not much in it.

Overall best value for money in Gen V: Black 2, again.

Gen VI

View attachment 371129 View attachment 371130

X: 557 77.25% or 418 57.97%
Y: 557 77.25% or 418 57.97%

Notes
Total parity is the story of the day as we enter Gen VI, and 721 Pokemon in total. Both games have the same amount of exclusives (18) and the same overall number of Pokemon.

For once, the usual formulas do not apply. The player gets a starter, but they can get a second Kalos starter after beating the Elite 4. For the first time the player can only get one of the birds. The usual starter formula applies to the intruding Kanto trio, though, and the fossils, as ever.

Trade-exclusive mons get interesting in these games; thanks to an in-game trade, Steelix is obtainable, and Politoed can be caught wild. One of Clamperl's evos can be caught, too. Milotic is still trade-exclusive, though. Bizarrely, though Trevenant was introduced in this generation, the game doesn't seem bothered about doing things the right way; it's catchable wild. The other three trade-exclusive mons introduced in XY are not.

The Friend Safari makes this interesting. After all, it's part of the game and not a bonus feature. On the other hand, it requires additional consoles to make it work. I'm in two minds. If it is included, XY potentially have 557 Pokemon obtainable. If not, it's just 418 per game.

Best value for money: no appreciable difference.

View attachment 371135 View attachment 371134

Omega Ruby: 421 58.39%
Alpha Sapphire: 421 58.39%

Notes
Just barely more than XY has sans Friend Safari. 21 missing from each game.

For the first time in a while, no trade evolution mons (except Milotic) can be obtained wild. This is the only game since its introduction where Trevenant cannot be caught without actually evolving it how it's supposed to be evolved. Really curious. Our first mythical available in-game, too. That's cool.

Best value for money: no appreciable difference.

Best value for money in Gen VI: It's a tough one. The fact that ORAS permits access to the Mega Stones more readily than XY might tip the balance, despite these only being forms and not discrete species in their own right. But in terms of potential availability XY win out.

Gen VII

View attachment 371138 View attachment 371139

Sun: 353 44.04%
Moon: 353 44.04%

Notes
Absolutely dismal numbers, just narrowly beating FRLG to be the series' worst showing. Hardly fitting for the 20th anniversary games as the series reaches 802 Pokemon.

There are just 15 version exclusives between the two games. No fossils here, though. Two of the original trade evo mons - Golem and Gengar - are available without trading. Slowking and Politoed are catchable, while Conkeldurr and Trevenant are also available wild.

Magearna is a curiosity. On the one hand, it does involve a code not found in the game natively. On the other hand, it's available indefinitely, and requires zero effort. On balance, it's in. The same goes for Island Scan mons, since any QR code can be used to charge up the scanner.

Best value for money: no appreciable difference.

View attachment 371141 View attachment 371142

US: 550 68.57%
UM: 550 68.57%

Notes
Much improved. USUM rounds up to 550 mons available as the games expand to 807 Pokemon available overall. Golem is no longer obtainable in-game, but both Gorebyss and Huntail are catchable in one game for the first time. Gengar, Politoed, Slowking, and Trevenant remain catchable. Thanks to the onslaught of legends available, there are a whopping 28 version exclusives.

Best value for money: No appreciable difference

Overall best value for money in Gen VII: Either of the Ultra versions.

Gen VIII

View attachment 371143 View attachment 371146

Sword 364 40.89% or 364 83.67%
Shield 364 40.89% or 364 83.67%

Notes
A quite unique case here, and a potential endless debate. If you believe that all the Dexited Pokemon still count, it's an absolutely miserable showing - just 40.89% of all Pokemon, one of the worst in the series. If you consider only the Pokemon coded into the base game, then it's a far better picture - 83.67% of all the Pokemon, one of the best in the series.

Whatever the case, SwSh have the largest amount of version-exclusives in the series - 30. But while the starters are still a choice, everything else is tossed out. You can get all four fossil mons. All trade evo mons are now capturable in the Wild Area - and let's assume at some point online access for the Switch gets disabled. They'd still all be capturable without it.

The IoA expansion adds 110 Pokemon, of which 6 are exclusive to either Sword or Shield. A further nine are inaccessible - Porygon2 and PorygonZ remain trade-exclusive, while only one Alola starter can be chosen and Zarude, of course, is event-exclusive. So 95 are accessible.

CT adds 74 Pokemon, of which 13 are exclusive to either game and two - the Regi and Calyrex's steed - become inaccessible once their counterpart is chosen, meaning you get 59 overall. There's no version difference, though.

Best value for money: no appreciable difference.

So, which is the best and which is the worst title when it comes to Pokemon content and value for money?

Going by percentages, amusingly Pokemon Yellow of all games is statistically the best title. It has the most Pokemon available relative to the maximum (admittedly not hard to do when it's the first generation) and has more species available proportionally than any other game in the series.

If we choose to ignore Colosseum and XD as outliers (I included them for the sake of interest, but I don't think they can be judged on the same criteria as the rest of the series) then the original Sun and Moon are statistically the worst games. Ironic, especially considering FireRed narrowly misses out on the bottom rung.

Some surprises, some revelations, and some serious number-crunching. I hope you found this interesting, and thanks for reading if you made it this far.

In Gen 2, Gold/Silver evolution stones are limited to just one per type so it'll be down to less than 206

Ransei · Dec 29, 2022

It's probably important to mention that XY (including Friend Safari) + ORAS = the entire National Dex up to Gen 6. You can still get the certificate without having a mythical and so aside from Gen 1, Gen 6 is the only generation where you can complete the National Dex using only its mainline games. You can transfer but it's not required.

Edit: Gen 6 was also the generation that went out of its way to give us every mythical ever at the time

.

Altissimo · Dec 29, 2022

Thanks for posting this! I'm really annoyed that no one else seems to want to compile this kind of information on their Pokémon websites in a clearly accessible manner.

I was working on effectively the same thing for my own purposes, and then this got bumped while I was busy working on, bringing it back to my attention. In reviewing, I've found a few discrepancies between my data and yours. I'd like to use this thread as a means to post my own data, as well as a few other numbers I collected - hope you don't mind.

The following spoiler contains a list of every Pokémon added in each game, along with a running total of a) the total number of Pokémon and b) the total number of Pokémon added by generation. In my calculations, I may refer to something like a game having access to "all of Gen 4's mons", in which case I refer to the specific list of "Pokémon added in gen 4" in the below spoiler. If I say "all of Gen 4's mons", it can also be assumed that any evolutionary relatives to a Gen 4 mon introduced in any game prior to Gen 4 are included by default, except in the following cases:

FRLG's pre-National dex does not count cross-gen relatives introduced after Gen 1, but they are available in the code & can be obtained within FRLG post-National dex
LGPE does not include cross-gen relatives introduced after Gen 1, full stop
BDSP does not include cross-gen relatives introduced after Gen 4, full stop

The number in parentheses is the running total.
Bulbasaur, Ivysaur, Venusaur (3)
Charmander, Charmeleon, Charizard (6)
Squirtle, Wartortle, Blastoise (9)
Caterpie, Metapod, Butterfree (12)
Weedle, Kakuna, Beedrill (15)
Pidgey, Pidgeotto, Pidgeot (18)
Rattata, Raticate (20)
Spearow, Fearow (22)
Ekans, Arbok (24)
Pikachu, Raichu (26)
Sandshrew, Sandslash (28)
Nidoran-F, Nidorina, Nidoqueen (31)
Nidoran-M, Nidorino, Nidoking (34)
Clefairy, Clefable (36)
Vulpix, Ninetales (38)
Jigglypuff, Wigglytuff (40)
Zubat, Golbat (42)
Oddish, Gloom, Vileplume (45)
Paras, Parasect (47)
Venonat, Venomoth (49)
Diglett, Dugtrio (51)
Meowth, Persian (53)
Psyduck, Golduck (55)
Mankey, Primeape (57)
Growlithe, Arcanine (59)
Poliwag, Poliwhirl, Politoed (62)
Abra, Kadabra, Alakazam (65)
Machop, Machoke, Machamp (68)
Bellsprout, Weepinbell, Victreebel (71)
Tentacool, Tentacruel (73)
Geodude, Graveler, Golem (76)
Ponyta, Rapidash (78)
Slowpoke, Slowbro (80)
Magnemite, Magneton (82)
Farfetch'd (83)
Doduo, Dodrio (85)
Seel, Dewgong (87)
Grimer, Muk (89)
Shellder, Cloyster (91)
Gastly, Haunter, Gengar (94)
Onix (95)
Drowzee, Hypno (97)
Krabby, Kingler (99)
Voltorb, Electrode (101)
Exeggcute, Exeggutor (103)
Cubone, Marowak (105)
Hitmonlee, Hitmonchan (107)
Lickitung (108)
Koffing, Weezing (110)
Rhyhorn, Rhydon (112)
Chansey (113)
Tangela (114)
Kangaskhan (115)
Horsea, Seadra (117)
Goldeen, Seaking (119)
Staryu, Starmie (121)
Mr. Mime (122)
Scyther (123)
Jynx (124)
Electabuzz (125)
Magmar (126)
Pinsir (127)
Tauros (128)
Magikarp, Gyarados (130)
Lapras (131)
Ditto (132)
Eevee, Vaporeon, Jolteon, Flareon (136)
Porygon (137)
Omanyte, Omastar (139)
Kabuto, Kabutops (141)
Aerodactyl (142)
Snorlax (143)
Articuno (144)
Zapdos (145)
Moltres (146)
Dratini, Dragonair, Dragonite (149)
Mewtwo (150)
Mew (151)

The first number is the overall running total. The second number is the running total of Pokémon added in this Gen.
Chikorita, Bayleef, Meganium (154) (3)
Cyndaquil, Quilava, Typhlosion (157) (6)
Totodile, Croconaw, Feraligatr (160) (9)
Sentret, Furret (162) (11)
Hoothoot, Noctowl (164) (13)
Ledyba, Ledian (166) (15)
Spinarak, Ariados (168) (17)
Crobat (169) (18)
Chinchou, Lanturn (171) (20)
Pichu (172) (21)
Cleffa (173) (22)
Igglybuff (174) (23)
Togepi, Togetic (176) (25)
Natu, Xatu (178) (27)
Mareep, Flaaffy, Ampharos (181) (30)
Bellossom (182) (31)
Marill, Azumarill (184) (33)
Sudowoodo (185) (34)
Politoed (186) (35)
Hoppip, Skiploom, Jumpluff (189) (38)
Aipom (190) (39)
Sunkern, Sunflora (192) (41)
Yanma (193) (42)
Wooper, Quagsire (195) (44)
Espeon, Umbreon (197) (46)
Murkrow (198) (47)
Slowking (199) (48)
Misdreavus (200) (49)
Unown (201) (50)
Wobbuffet (202) (51)
Girafarig (203) (52)
Pineco, Forretress (205) (54)
Dunsparce (206) (55)
Gligar (207) (56)
Steelix (208) (57)
Snubbull, Granbull (210) (59)
Qwilfish (211) (60)
Scizor (212) (61)
Shuckle (213) (62)
Heracross (214) (63)
Sneasel (215) (64)
Teddiursa, Ursaring (217) (66)
Slugma, Magcargo (219) (68)
Swinub, Piloswine (221) (70)
Corsola (222) (71)
Remoraid, Octillery (224) (73)
Delibird (225) (74)
Mantine (226) (75)
Skarmory (227) (76)
Houndour, Houndoom (229) (78)
Kingdra (230) (79)
Phanpy, Donphan (232) (81)
Porygon2 (233) (82)
Stantler (234) (83)
Smeargle (235) (84)
Tyrogue, Hitmontop (237) (86)
Smoochum (238) (87)
Elekid (239) (88)
Magby (240) (89)
Miltank (241) (90)
Blissey (242) (91)
Raikou (243) (92)
Entei (244) (93)
Suicune (245) (94)
Larvitar, Pupitar, Tyranitar (248) (97)
Lugia (249) (98)
Ho-Oh (250) (99)
Celebi (251) (100)

Gen 2 introduces 100 new Pokémon.

Treecko, Grovyle, Sceptile (254) (3)
Torchic, Combusken, Blaziken (257) (6)
Mudkip, Marshtomp, Swampert (260) (9)
Poochyena, Mightyena (262) (11)
Zigzagoon, Linoone (264) (13)
Wurmple, Silcoon, Beautifly, Cascoon, Dustox (269) (18)
Lotad, Lombre, Ludicolo (272) (21)
Seedot, Nuzleaf, Shiftry (275) (24)
Taillow, Swellow (277) (26)
Wingull, Pelipper (279) (28)
Ralts, Kirlia, Gardevoir (282) (31)
Surskit, Masquerain (284) (33)
Shroomish, Breloom (286) (35)
Slakoth, Vigoroth, Slaking (289) (38)
Nincada, Ninjask, Shedinja (292) (41)
Whismur, Loudred, Exploud (295) (44)
Makuhita, Hariyama (297) (46)
Azurill (298) (47)
Nosepass (299) (48)
Skitty, Delcatty (301) (50)
Sableye (302) (51)
Mawile (303) (52)
Aron, Lairon, Aggron (306) (55)
Meditite, Medicham (308) (57)
Electrike, Manectric (310) (59)
Plusle (311) (60)
Minun (312) (61)
Volbeat (313) (62)
Illumise (314) (63)
Roselia (315) (64)
Gulpin, Swalot (317) (66)
Carvanha, Sharpedo (319) (68)
Wailmer, Wailord (321) (70)
Numel, Camerupt (323) (72)
Torkoal (324) (73)
Spoink, Grumpig (326) (75)
Spinda (327) (76)
Trapinch, Vibrava, Flygon (330) (79)
Cacnea, Cacturne (332) (81)
Swablu, Altaria (334) (83)
Zangoose (335) (84)
Seviper (336) (85)
Lunatone (337) (86)
Solrock (338) (87)
Barboach, Whiscash (340) (89)
Corphish, Crawdaunt (342) (91)
Baltoy, Claydol (344) (93)
Lileep, Cradily (346) (95)
Anorith, Armaldo (348) (97)
Feebas, Milotic (350) (99)
Castform (351) (100)
Kecleon (352) (101)
Shuppet, Banette (354) (103)
Duskull, Dusclops (356) (105)
Tropius (357) (106)
Chimecho (358) (107)
Absol (359) (108)
Wynaut (360) (109)
Snorunt, Glalie (362) (111)
Spheal, Sealeo, Walrein (365) (114)
Clamperl, Huntail, Gorebyss (368) (117)
Relicanth (369) (118)
Luvdisc (370) (119)
Bagon, Shelgon, Salamence (373) (122)
Beldum, Metang, Metagross (376) (125)
Regirock (377) (126)
Regice (378) (127)
Registeel (379) (128)
Latias (380) (129)
Latios (381) (130)
Kyogre (382) (131)
Groudon (383) (132)
Rayquaza (384) (133)
Jirachi (385) (134)
Deoxys (386) (135)

Gen 3 introduces 135 new Pokémon.

Turtwig, Grotle, Torterra (389) (3)
Chimchar, Monferno, Infernape (392) (6)
Piplup, Prinplup, Empoleon (395) (9)
Starly, Staravia, Staraptor (398) (12)
Bidoof, Bibarel (400) (14)
Kricketot, Kricketune (402) (16)
Shinx, Luxio, Luxray (405) (19)
Budew, Roserade (407) (21)
Cranidos, Rampardos (409) (23)
Shieldon, Bastiodon (411) (25)
Burmy, Wormadam, Mothim (414) (28)
Combee, Vespiquen (416) (30)
Pachirisu (417) (31)
Buizel, Floatzel (419) (33)
Cherubi, Cherrim (421) (35)
Shellos, Gastrodon (423) (37)
Ambipom (424) (38)
Drifloon, Drifblim (426) (40)
Buneary, Lopunny (428) (42)
Mismagius (429) (43)
Honchkrow (430) (44)
Glameow, Purugly (432) (46)
Chingling (433) (47)
Stunky, Skuntank (435) (49)
Bronzor, Bronzong (437) (51)
Bonsly (438) (52)
Mime Jr. (439) (53)
Happiny (440) (54)
Chatot (441) (55)
Spiritomb (442) (56)
Gible, Gabite, Garchomp (445) (59)
Munchlax (446) (60)
Riolu, Lucario (448) (62)
Hippopotas, Hippowdon (450) (64)
Skorupi, Drapion (452) (66)
Croagunk, Toxicroak (454) (68)
Carnivine (455) (69)
Finneon, Lumineon (457) (71)
Mantyke (458) (72)
Snover, Abomasnow (460) (74)
Weavile (461) (75)
Magnezone (462) (76)
Lickilicky (463) (77)
Rhyperior (464) (78)
Tangrowth (465) (79)
Electivire (466) (80)
Magmortar (467) (81)
Togekiss (468) (82)
Yanmega (469) (83)
Leafeon, Glaceon (471) (85)
Gliscor (472) (86)
Mamoswine (473) (87)
Porygon-Z (474) (88)
Gallade (475) (89)
Probopass (476) (90)
Dusknoir (477) (91)
Froslass (478) (92)
Rotom (479) (93)
Uxie (480) (94)
Mesprit (481) (95)
Azelf (482) (96)
Dialga (482) (97)
Palkia (484) (98)
Heatran (485) (99)
Regigigas (486) (100)
Giratina (487) (101)
Cresselia (488) (102)
Phione (489) (103)
Manaphy (490) (104)
Darkrai (491) (105)
Shaymin (492) (106)
Arceus (492) (107)

Gen 4 introduces 107 new Pokémon.

I got the same numbers you did. This is the easiest generation to verify so I would hope we end up on the same page. However, I'd just like to use this place to post some additional data for my own benefit; namely, the math by which I arrive at the number and the total collection of Pokémon species available in each game, so that I can refer back to this in the future, and so it's easier for others to check my math.

All "Gen 1" families can be obtained across RGBY, if the player has access to multiple games & appropriate trading hardware. Mew is Event-exclusive, or Glitch-exclusive.

The following Pokémon are available to a single player in any copy of Red, Green, Blue, and Yellow (counted w/ a running total):

Caterpie, Metapod, Butterfree (3)
Pidgey, Pidgeotto, Pidgeot (6)
Rattata, Raticate (8)
Spearow, Fearow (10)
Pikachu (11)
Nidoran-F, Nidorina, Nidoqueen (14)
Nidoran-M, Nidorino, Nidoking (17)
Clefairy, Clefable (19)
Jigglypuff, Wigglytuff (21)
Zubat, Golbat (23)
Paras, Parasect (25)
Venonat, Venomoth (27)
Diglett, Dugtrio (29)
Psyduck, Golduck (31)
Poliwag, Poliwhirl, Poliwrath (34)
Abra, Kadabra (36)
Machop, Machoke (38)
Tentacool, Tentacruel (40)
Geodude, Graveler (42)
Ponyta, Rapidash (44)
Slowpoke, Slowbro (46)
Magnemite, Magneton (48)
Farfetch'd (49)
Doduo, Dodrio (51)
Seel, Dewgong (53)
Grimer, Muk (55)
Shellder, Cloyster (57)
Gastly, Haunter (59)
Onix (60)
Drowzee, Hypno (62)
Krabby, Kingler (64)
Voltorb, Electrode (66)
Exeggcute, Exeggutor (68)
Cubone, Marowak (70)
Lickitung (71)
Rhyhorn, Rhydon (73)
Chansey (74)
Tangela (75)
Kangaskhan (76)
Horsea, Seadra (78)
Goldeen, Seaking (80)
Staryu, Starmie (82)
Mr. Mime (83)
Tauros (84)
Magikarp, Gyarados (86)
Lapras (87)
Ditto (88)
Eevee (89)
Porygon (90)
Aerodactyl (91)
Snorlax (92)
Articuno (93)
Zapdos (94)
Moltres (95)
Dratini, Dragonair, Dragonite (98)
Mewtwo (99)

Each game begins with a base availability of 99 Pokémon.
RGB each get 1 starter, for an addition of 3. Yellow gets all 3 starters, for an addition of 9.
RGB = 102
Y = 108
RGB gets Raichu where Yellow does not.
RGB = 103
Y = 108
Each game gets 1 Fossil, with 2 Pokémon in its evolutionary line.
RGB = 105
Y = 110
Each game gets 1 Hitmon.
RGB = 106
Y = 111
Each game gets 1 Eeveelution.
RGB = 107
Y = 112
Next, each game gets version exclusive families.

Red: 107 +
Weedle, Kakuna, Beedrill (110)
Ekans, Arbok (112)
Oddish, Gloom, Vileplume (115)
Mankey, Primeape (117)
Growlithe, Arcanine (119)
Koffing, Weezing (121)
Scyther (122)
Jynx (123)
Electabuzz (124)

Green (which I use to refer to Japanese Green, which became International Blue; green_typhlosion refers to this as "Blue"): 107 +
Weedle, Kakuna, Beedrill (110)
Sandshrew, Sandslash (112)
Vulpix, Ninetales (114)
Meowth, Persian (116)
Bellsprout, Weepinbell, Victreebel (119)
Koffing, Weezing (121)
Jynx (122)
Magmar (123)
Pinsir (124)

Blue (which I use to refer to Japanese Blue; green_typhlosion refers to this as "Green"): 107 +
Weedle, Kakuna, Beedrill (110)
Sandshrew, Sandslash (112)
Oddish, Gloom, Vileplume (115)
Meowth, Persian (117)
Growlithe, Arcanine (119)
Koffing, Weezing (121)
Scyther (122)
Jynx (123)
Pinsir (124)

Yellow: 112 +
Sandshrew, Sandslash (114)
Vulpix, Ninetales (116)
Oddish, Gloom, Vileplume (119)
Mankey, Primeape (121)
Bellsprout, Weepinbell, Victreebel (124)
Scyther (125)
Pinsir (126)

Totals after version exclusives:
RGB = 124
Y = 126
Then, a few Pokémon that can only be obtained via trade evolution can be obtained via in-game trade.
Yellow gets Machamp.
RGB = 124
Y = 127
Blue gets Golem and Gengar.
RG = 124
B = 126
Y = 127

With only access to RBGY and no other games, you can get 150 Pokémon with the exception of Mew.

The following Pokémon are available to a single player in any one copy of Gold, Silver, or Crystal (and note I will be combining cross-gen evolutionary relatives for readability's sake):

Caterpie, Metapod, Butterfree (3)
Weedle, Kakuna, Beedrill (6)
Pidgey, Pidgeotto, Pidgeot (9)
Rattata, Raticate (11)
Spearow, Fearow (13)
Ekans, Arbok (15)
Pichu, Pikachu (17)
Sandshrew, Sandslash (19)
Nidoran-F, Nidorina, Nidoqueen (22)
Nidoran-M, Nidorino, Nidoking (25)
Cleffa, Clefairy, Clefable (28)
Igglybuff, Jigglypuff, Wigglytuff (31)
Zubat, Golbat, Crobat (34)
Oddish, Gloom, Bellossom (37)
Paras, Parasect (39)
Venonat, Venomoth (41)
Diglett, Dugtrio (43)
Psyduck, Golduck (45)
Poliwag, Poliwhirl (47)
Abra, Kadabra (49)
Machop, Machoke (51)
Bellsprout, Weepinbell (53)
Tentacool, Tentacruel (55)
Geodude, Graveler (57)
Ponyta, Rapidash (59)
Slowpoke, Slowbro (61)
Magnemite, Magneton (63)
Farfetch'd (64)
Doduo, Dodrio (66)
Seel, Dewgong (68)
Grimer, Muk (70)
Shellder (71)
Gastly, Haunter (73)
Onix (74)
Drowzee, Hypno (76)
Krabby, Kingler (78)
Voltorb, Electrode (80)
Exeggcute (81)
Cubone, Marowak (83)
Tyrogue, Hitmonlee, Hitmonchan, Hitmontop (87)
Lickitung (88)
Koffing, Weezing (90)
Rhyhorn, Rhydon (92)
Chansey, Blissey (94)
Tangela (95)
Kangaskhan (96)
Horsea, Seadra (98)
Goldeen, Seaking (100)
Staryu (101)
Mr. Mime (102)
Scyther (103)
Smoochum, Jynx (105)
Elekid, Electabuzz (107)
Magby, Magmar (109)
Pinsir (110)
Tauros (111)
Magikarp, Gyarados (113)
Lapras (114)
Ditto (115)
Eevee, Espeon, Umbreon (118)
Porygon (119)
Aerodactyl (120)
Snorlax (121)
Dratini, Dragonair, Dragonite (124)

Sentret, Furret (126)
Hoothoot, Noctowl (128)
Chinchou, Lanturn (130)
Togepi, Togetic (132)
Natu, Xatu (134)
Marill, Azumarill (136)
Sudowoodo (137)
Hoppip, Skiploom, Jumpluff (140)
Aipom (141)
Sunkern, Sunflora (143)
Yanma (144)
Wooper, Quagsire (146)
Murkrow (147)
Misdreavus (148)
Unown (149)
Wobbuffet (150)
Pineco, Forretress (152)
Dunsparce (153)
Snubbull, Granbull (155)
Qwilfish (156)
Shuckle (157)
Heracross (158)
Sneasel (159)
Slugma, Magcargo (161)
Swinub, Piloswine (163)
Corsola (164)
Houndour, Houndoom (166)
Stantler (167)
Smeargle (168)
Miltank (169)
Raikou (170)
Entei (171)
Suicune (172)
Larvitar, Pupitar, Tyranitar (175)
Lugia (176)
Ho-Oh (177)

Each game gets 1 starter for 3 additional entries, putting the count at 180. After that, we have version exclusives.

Gold: 180 +
Mankey, Primeape (182)
Growlithe (183)
Spinarak, Ariados (185)
Mareep, Flaaffy, Ampharos (188)
Girafarig (189)
Gligar (190)
Teddiursa, Ursaring (192)
Remoraid, Octillery (194)
Mantine (195)

Silver: 180 +
Vulpix (181)
Meowth, Persian (183)
Ledyba, Ledian (185)
Mareep, Flaaffy, Ampharos (188)
Girafarig (189)
Remoraid, Octillery (191)
Delibird (192)
Skarmory (193)
Phanpy, Donphan (195)

Crystal: 180 +
Meowth, Persian (182)
Growlithe (183)
Ledyba, Ledian (185)
Spinarak, Ariados (187)
Gligar (188)
Teddiursa, Ursaring (190)
Delibird (191)
Mantine (192)
Skarmory (193)
Phanpy, Donphan (195)

They are all tied at 195. But wait - Zilche pointed out the problem with the lack of evolutionary stones in GSC. If you look at my previous lists, you'll notice I've excluded every evolution from Fire Stone, Thunderstone, Leaf Stone, or Water Stone. Sun Stones and Moon Stones have infinite sources, so their evolutions are included.
Vanilla GS, without use of Mystery Gift, have access to only one of each Stone. Crystal, however, adds Pokegear numbers to get multiple Stones. So keeping this in mind, we can add 4 to each of Gold and Silver (one for each Stone) which you can use on any Pokémon that evolves via Stone. This puts GS at 199. Crystal gets a few more:
Growlithe, Eevee (2)
Poliwrath, Shellder, Staryu, Eevee (6)
Pikachu, Eevee (8)
Gloom, Weepinbell, Exeggcute (11)
for a total of 206, or 207 if Celebi is included. The number for Crystal is the same as green_typhlosion's, but Gold and Silver take a slight hit due to the lack of appropriate stones.

With only access to GSC and no other games, you can get (251 - 9 Kanto starters - 4 Kanto fossils - 4 Kanto legendaries - Mew - Celebi) 232 Pokémon of the total 251, or 233 if you include Celebi.

This is where I take a slightly different interest in the data, because this is the first game with a regional dex!
What I'm going to do here is both post the game's regional dex's families, and then calculate how many Pokémon the game can get both out of the regional total and the national total. With RS that thankfully isn't too annoying since RS doesn't include any Pokémon that aren't in its regional dex, but starting with Emerald (and continuing basically until Dexit) every game to follow does have Pokémon from the national dex as well.

Here are the Pokémon in the Hoenn Regional Dex:

All Gen 3 Families are included for a total of 135 mons.
Other families:
Pichu, Pikachu, Raichu (138)
Sandshrew, Sandslash (140)
Vulpix, Ninetales (142)
Igglybuff, Jigglypuff, Wigglytuff (145)
Zubat, Golbat, Crobat (148)
Oddish, Gloom, Vileplume, Bellossom (152)
Psyduck, Golduck (154)
Abra, Kadabra, Alakazam (157)
Machop, Machoke, Machamp (160)
Tentacool, Tentacruel (162)
Geodude, Graveler, Golem (165)
Magnemite, Magneton (167)
Doduo, Dodrio (169)
Grimer, Muk (171)
Voltorb, Electrode (173)
Koffing, Weezing (175)
Rhyhorn, Rhydon (177)
Horsea, Seadra, Kingdra (180)
Goldeen, Seaking (182)
Staryu, Starmie (184)
Pinsir (185)
Magikarp, Gyarados (187)

Chinchou, Lanturn (189)
Natu, Xatu (191)
Marill, Azumarill (193)
Wobbuffet (194)
Girafarig (195)
Heracross (196)
Slugma, Magcargo (198)
Corsola (199)
Skarmory (200)
Phanpy, Donphan (202)

There are a total of 202 species in the Hoenn Dex, or 200 if you discount Jirachi and Deoxys.

The following are available to any one copy of Ruby, Sapphire, or Emerald:

Pichu, Pikachu, Raichu (3)
Sandshrew, Sandslash (5)
Vulpix, Ninetales (7)
Igglybuff, Jigglypuff (9)
Zubat, Golbat, Crobat (12)
Oddish, Gloom, Vileplume, Bellossom (16)
Psyduck, Golduck (18)
Abra, Kadabra (20)
Machop, Machoke (22)
Tentacool, Tentacruel (24)
Geodude, Graveler (26)
Magnemite, Magneton (28)
Doduo, Dodrio (30)
Grimer, Muk (32)
Voltorb, Electrode (34)
Koffing, Weezing (36)
Rhyhorn, Rhydon (38)
Horsea, Seadra (40)
Goldeen, Seaking (42)
Staryu, Starmie (44)
Pinsir (45)
Magikarp, Gyarados (47)

Chinchou, Lanturn (49)
Natu, Xatu (51)
Azurill, Marill, Azumarill (54)
Wynaut, Wobbuffet (56)
Girafarig (57)
Heracross (58)
Slugma, Magcargo (60)
Corsola (61)
Skarmory (62)
Phanpy, Donphan (64)

Poochyena, Mightyena (66)
Zigzagoon, Linoone (68)
Wurmple, Silcoon, Beautifly, Cascoon, Dustox (73)
Taillow, Swellow (75)
Wingull, Pelipper (77)
Ralts, Kirlia, Gardevoir (80)
Shroomish, Breloom (82)
Slakoth, Vigoroth, Slaking (85)
Nincada, Ninjask, Shedinja (88)
Whismur, Loudred, Exploud (91)
Makuhita, Hariyama (93)
Nosepass (94)
Skitty (95)
Aron, Lairon, Aggron (98)
Electrike, Manectric (100)
Plusle (101)
Minun (102)
Volbeat (103)
Illumise (104)
Gulpin, Swalot (106)
Carvanha, Sharpedo (108)
Wailmer, Wailord (110)
Numel, Camerupt (112)
Torkoal (113)
Spoink, Grumpig (115)
Spinda (116)
Trapinch, Vibrava, Flygon (119)
Cacnea, Cacturne (121)
Swablu, Altaria (123)
Barboach, Whiscash (125)
Corphish, Crawdaunt (127)
Baltoy, Claydol (129)
Feebas, Milotic (131)
Castform (132)
Kecleon (133)
Shuppet, Banette (135)
Duskull, Dusclops (137)
Tropius (138)
Chimecho (139)
Absol (140)
Snorunt, Glalie (142)
Spheal, Sealeo, Walrein (145)
Clamperl (146)
Relicanch (147)
Luvdisc (148)
Bagon, Shelgon, Salamence (151)
Beldum, Metang, Metagross (154)
Regirock (155)
Regice (156)
Registeel (157)
Rayquaza (158)

Each game starts with a 158 base.
Each game gets 1 starter for 3 extra entries, putting the total at 161.
Ruby and Sapphire get 1 Fossil for 2 entries, while Emerald gets both for 4, putting us at:
RS - 163
E - 165
Each game gets one Lati:
RS - 164
E- 166
Now for version exclusives:

Ruby: 164 +
Seedot, Nuzleaf, Shiftry (167)
Surskit, Masquerain (169)
Mawile (170)
Meditite, Medicham (172)
Roselia (173)
Zangoose (174)
Solrock (175)
Groudon (176)

Sapphire: 164 +
Lotad, Lombre, Ludicolo (167)
Surskit, Masquerain (169)
Sableye (170)
Meditite, Medicham (172)
Roselia (173)
Seviper (174)
Lunatone (175)
Kyogre (176)

Emerald: 166 +
Lotad, Lombre, Ludicolo (169)
Seedot, Nuzleaf, Shiftry (172)
Sableye (173)
Mawile (174)
Seviper (175)
Solrock (176)
Kyogre, Groudon (178)

Totals: 176, 176, and 178. But as DrPumpkinz pointed out, Ruby and Emerald both have only one natural Moon Stone, and two Pokémon that evolve with it. So we can add 1 Moon Stone mon to Ruby and Emerald, and 2 to Sapphire, for the following regional dex totals -
Ruby: 177
Sapphire: 178
Emerald: 179
This is actually a different number than green_typhlosion ended up with, and I think I know why: they report that Emerald is missing "7 Pokémon instead of 8", but that's not actually true - it's still 8 when you consider that Emerald can only get one of the Lati's. In fact, Ruby and Emerald have the same availability between version-exclusives and Moon Stones - the 2-mon difference here is because of Emerald's ability to get an extra Fossil.

Moving on to the Emerald additions. Emerald adds the following families:

Keeping a running total of additions as well.
179 +
Meowth, Persian (181) (2)
Ditto (182) (3)
Hoothoot, Noctowl (184) (5)
Ledyba, Ledian (186) (7)
Spinarak, Ariados (188) (9)
Mareep, Flaaffy, Ampharos (191) (12)
Sudowoodo (192) (13)
Aipom (193) (14)
Sunkern, Sunflora (195) (16) (Emerald has access to a second Sun Stone via wild Solrock)
Wooper, Quagsire (197) (18)
Pineco, Forretress (199) (20)
Gligar (200) (21)
Snubbull, Granbull (202) (23)
Shuckle (203) (24)
Teddiursa, Ursaring (205) (26)
Remoraid, Octillery (207) (28)
Houndour, Houndoom (209) (30)
Stantler (210) (31)
Smeargle (211) (32)
Miltank (212) (33)

Emerald's final count is 212 of the 386 in the National Dex.

With only access to RSE and no other games, you can get up to 233 National Dex Pokémon (200 Hoenn Dex + 33 Emerald additions), or as many as 242 if you're able to complete the Hoenn Dex on Emerald three times to get each of the Johto starters.

Like green_typhlosion said, verifying some info for FRLG is difficult lol

The Kanto Dex used in this game retains the same species from Gen 1 - no cross-evolutions are available - putting us back at 150 or 151.
Another slightly odd point I should make is that it's now possible to get both Hitmon forms and all Eevee evolutions with breeding, but breeding doesn't open up until you've already gotten the national dex. Thus I'll be ignoring the existence of breeding for the regional dex calculations, but adding it to the national dex calcs. If you want to count the other Hitmon and the other two Eevee evolutions, just add +3 to the final regional total.

Caterpie, Metapod, Butterfree (3)
Weedle, Kakuna, Beedrill (6)
Pidgey, Pidgeotto, Pidgeot (9)
Rattata, Raticate (11)
Spearow, Fearow (13)
Pikachu, Raichu (15)
Nidoran-F, Nidorina, Nidoqueen (18)
Nidoran-M, Nidorino, Nidoking (21)
Clefairy, Clefable (23)
Jigglypuff, Wigglytuff (25)
Zubat, Golbat (27)
Paras, Parasect (29)
Venonat, Venomoth (31)
Diglett, Dugtrio (33)
Meowth, Persian (35)
Mankey, Primeape (37)
Poliwag, Poliwhirl, Poliwrath (40)
Abra, Kadabra (42)
Machop, Machoke (44)
Tentacool, Tentacruel (46)
Geodude, Graveler (48)
Ponyta, Rapidash (50)
Magnemite, Magneton (52)
Farfetch'd (53)
Doduo, Dodrio (55)
Seel, Dewgong (57)
Grimer, Muk (59)
Gastly, Haunter (61)
Onix (62)
Drowzee, Hypno (64)
Krabby, Kingler (66)
Voltorb, Electrode (68)
Exeggcute, Exeggutor (70)
Cubone, Marowak (72)
Lickitung (73)
Koffing, Weezing (75)
Rhyhorn, Rhydon (77)
Chansey (78)
Tangela (79)
Kangaskhan (80)
Horsea, Seadra (82)
Goldeen, Seaking (84)
Mr. Mime (85)
Jynx (86)
Tauros (87)
Magikarp, Gyarados (89)
Lapras (90)
Ditto (91)
Eevee (92)
Porygon (93)
Aerodactyl (94)
Snorlax (95)
Articuno (96)
Zapdos (97)
Moltres (98)
Dratini, Dragonair, Dragonite (101)
Mewtwo (102)

Each game has a base availability of 102.
Add 1 starter for 105.
Add 1 fossil for 107.
Add 1 Eeveelution for 108.
Add 1 Hitmon for 109.
Next, the version exclusives.

FR: 109 +
Ekans, Arbok (111)
Oddish, Gloom, Vileplume (114)
Psyduck, Golduck (116)
Growlithe, Arcanine (118)
Shellder, Cloyster (120)
Scyther (121)
Electabuzz (122)

LG: 109 +
Sandshrew, Sandslash (111)
Vulpix, Ninetales (113)
Bellsprout, Weepinbell, Victreebel (116)
Slowpoke, Slowbro (118)
Staryu, Starmie (120)
Magmar (121)
Pinsir (122)

Within just the regional dex, each game has access to 122 of 150/151 Pokémon. The number is slightly smaller than the originals due to a slightly larger number of version-exclusives.

Now moving on to the National Dex. As stated before, this gives you the ability to breed, giving you access to another Hitmon + Eevee for a total of 125. In addition, you can now get the following evolutionary relatives of Gen 1 Pokémon:

125 +
Pichu (126)
Cleffa (127)
Igglybuff (128)
Crobat (129)
Tyrogue, Hitmontop (131)
Blissey (132)
Smoochum (133)

The total here is 133 across games. There are also 3 cross-gen evos that are version exclusive: Bellossom and Elekid to FR and Magby to LG, putting us at 135 for FR and 134 for LG.

Now, moving on to the added National Dex Pokémon. I'll just keep a total of these by themselves since FR and LG's totals have already diverged.

Sentret, Furret (2)
Ledyba, Ledian (4)
Spinarak, Ariados (6)
Togepi, Togetic (8)
Natu, Xatu (10)
Hoppip, Skiploom, Jumpluff (13)
Yanma (14)
Unown (15)
Wynaut, Wobbuffet (17)
Dunsparce (18)
Heracross (19)
Slugma, Magcargo (21)
Swinub, Piloswine (23)
Phanpy, Donphan (25)
Larvitar, Pupitar, Tyranitar (28)

The total now is 163 for FR and 162 for LG.
Each game can also get 1 Johto Beast dependent on their starter, bringing the total to 164 for FR and 163 for LG.

Moving on to newly-added version exclusives:

FR: 164 +
Wooper, Quagsire (166)
Murkrow (167)
Qwilfish (168)
Delibird (169)
Skarmory (170)

LG: 163 +
Azurill, Marill, Azumarill (166)
Misdreavus (167)
Sneasel (168)
Remoraid, Octillery (170)
Mantine (171)

The final total is 170 for FR and 171 for LG. This differs from green_typhlosion's count by 1, which I think can be explained by their saying that "FR has 23 missing Pokémon while LG has 22" - while technically true, I think what happened is they failed to take into account that one of these exclusives is Scizor and another is Slowking, which require trading.

If you have access to just FRLG and no other games, your total National Dex number is (150 + 16 cross-gen Pokémon (including trade evolutions) + 28 Johto additions + 14 version-exclusive Johto additions + 3 Johto beasts) = 211.

Everyone who was around when DP was released knows that DP contained every non-legendary and non-starter except for Tangela and Tropius, which were added in Platinum. That makes the numbers a little easier, but I'm still going to use additive math here because I want to be consistent & have this as a resource for myself.

DPPt had a total of 493 Pokémon available, but the first Sinnoh Dex in DPP contained 151 of them.

Pichu, Pikachu, Raichu (3)
Cleffa, Clefairy, Clefable (6)
Zubat, Golbat, Crobat (9)
Psyduck, Golduck (11)
Abra, Kadabra, Alakazam (14)
Machop, Machoke, Machamp (17)
Tentacool, Tentacruel (19)
Geodude, Graveler, Golem (22)
Ponyta, Rapidash (24)
Gastly, Haunter, Gengar (27)
Onix, Steelix (29)
Happiny, Chansey, Blissey (32)
Goldeen, Seaking (34)
Mime Jr., Mr. Mime (36)
Magikarp, Gyarados (38)
Munchlax, Snorlax (40)

Hoothoot, Nocrowl (42)
Azurill, Marill, Azumarill (45)
Bonsly, Sudowoodo (47)
Aipom, Ambipom (49)
Wooper, Quagsire (51)
Murkrow, Honchkrow (53)
Misdreavus, Mismagius (55)
Unown (56)
Girafarig (57)
Heracross (58)
Sneasel, Weavile (60)
Remoraid, Octillery (62)
Mantyke, Mantine (64)

Wurmple, Silcoon, Beautifly, Cascoon, Dustox (69)
Wingull, Pelipper (71)
Meditite, Medicham (73)
Budew, Roselia, Roserade (76)
Barboach, Whiscash (78)
Feebas, Milotic (80)
Chingling, Chimecho (82)

Turtwig, Grotle, Torterra (85)
Chimchar, Monferno, Infernape (88)
Piplup, Prinplup, Empoleon (91)
Starly, Staravia, Staraptor (94)
Bidoof, Bibarel (96)
Kricketot, Kricketune (98)
Shinx, Luxio, Luxray (101)
Cranidos, Rampardos (103)
Shieldon, Bastiodon (105)
Burmy, Wormadam, Mothim (108)
Combee, Vespiquen (110)
Pachirisu (111)
Buizel, Floatzel (113)
Cherubi, Cherrim (115)
Shellos, Gastrodon (117)
Drifloon, Drifblim (119)
Buneary, Lopunny (121)
Glameow, Honchkrow (123)
Stunky, Skuntank (125)
Bronzor, Bronzong (127)
Chatot (128)
Spiritomb (129)
Gible, Gabite, Garchomp (132)
Riolu, Lucario (134)
Hippopotas, Hippowdon (136)
Skorupi, Drapion (138)
Croagunk, Toxicroak (140)
Carnivine (141)
Finneon, Lumineon (143)
Snover, Abomasnow (145)
Uxie (146)
Mesprit (147)
Azelf (148)
Dialga (149)
Palkia (150)
Manaphy (151)

Platinum uses this same dex, but adds 59 additional species:

151 +
Magnemite, Magneton, Magnezone (154)
Lickitung, Lickilicky (156)
Rhyhorn, Rhydon, Rhyperior (159)
Tangela, Tangrowth (161)
Eevee, Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon (169)
Scyther, Scizor (171)
Elekid, Electabuzz, Electivire (174)
Magby, Magmar, Magmortar (177)
Porygon, Porygon2, Porygon-Z (180)

Togepi, Togetic, Togekiss (183)
Yanma, Yanmega (185)
Gligar, Gliscor (187)
Swinub, Piloswine, Mamoswine (190)
Houndour, Houndoom (192)

Ralts, Kirlia, Gardevoir, Gallade (196)
Nosepass, Probopass (198)
Swablu, Altaria (200)
Duskull, Dusclops, Dusknoir (203)
Tropius (204)
Absol (205)
Snorunt, Glalie, Froslass (208)

Rotom (209)
Giratina (210)

Here are the common species across DPPt:

Pichu, Pikachu, Raichu (3)
Cleffa, Clefairy, Clefable (6)
Zubat, Golbat, Crobat (9)
Psyduck, Golduck (11)
Abra, Kadabra (13)
Machop, Machoke (15)
Tentacool, Tentacruel (17)
Geodude, Graveler (19)
Ponyta, Rapidash (21)
Gastly, Haunter (23)
Onix, Steelix (25)
Happiny, Chansey, Blissey (28)
Goldeen, Seaking (30)
Magikarp, Gyarados (32)
Munchlax, Snorlax (34)
Hoothoot, Noctowl (36)
Azurill, Marill, Azumarill (39)
Aipom, Ambipom (41)
Wooper, Quagsire (43)
Unown (44)
Girafarig (45)
Heracross (46)
Sneasel, Weavile (48)
Remoraid, Octillery (50)
Mantyke, Mantine (52)
Wurmple, Silcoon, Beautifly, Cascoon, Dustox (57)
Wingull, Pelipper (59)
Meditite, Medicham (61)
Budew, Roselia, Roserade (64)
Barboach, Whiscash (66)
Feebas, Milotic (68)
Chingling, Chimecho (70)
Starly, Staravia, Staraptor (73)
Bidoof, Bibarel (75)
Kricketot, Kricketune (77)
Shinx, Luxio, Luxray (80)
Burmy, Wormadam, Mothim (83)
Combee, Vespiquen (85)
Pachirisu (86)
Buizel, Floatzel (88)
Cherubi, Cherrim (90)
Shellos, Gastrodon (92)
Drifloon, Drifblim (94)
Buneary, Lopunny (96)
Bronzor, Bronzong (98)
Chatot (99)
Gible, Gabite, Garchomp (102)
Riolu, Lucario (104)
Hippopotas, Hippowdon (106)
Skorupi, Drapion (108)
Croagunk, Toxicroak (110)
Carnivine (111)
Finneon, Lumineon (113)
Snover, Abomasnow (115)
Uxie (116)
Mesprit (117)
Azelf (118)

All three games have a base of 118 Pokémon.
Add 1 starter for 3 entries, to 121.
Add 1 fossil for 2 entries, to 123. Platinum has access to both fossils but can only get one of the two in any given save file, so I'm including it here.
Add the following version exclusives (subtracting the fossil):

Diamond: 123 +
Mime Jr., Mr. Mime (125)
Murkrow, Honchkrow (127)
Stunky, Skuntank (129)
Dialga (130)

Pearl: 123 +
Bonsly, Sudowoodo (125)
Misdreavus, Mismagius (127)
Stunky, Skuntank (129)
Palkia (130)

For Pokémon shared between all 3 games, Diamond and Pearl's final count is 130, which is actually greater than Platinum's 127. You can get Mime Jr. and Bonsly (normally version exclusives) in the updated Trophy Garden once you get the National Dex, so the total jumps to 132 for both games if you include that. We're not done adding entries to Platinum, yet, but also, you may notice I didn't add Dialga and Palkia to Platinum's count in the version exclusives spoiler. The reason for this is because, while both are available, they can't be accessed until the postgame, so I'll be waiting to add them until after adding Platinum's additions (as I did with the breedable Pokémon in FRLG).

Platinum's additions add the following:

127 +
Magnemite, Magneton, Magnezone (130)
Lickitung, Lickilicky (132)
Rhyhorn, Rhydon (134)
Tangela, Tangrowth (136)
Eevee, Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon (144)
Scyther (145)
Elekid, Electabuzz (147)
Magby, Magmar (149)
Porygon (150)
Togepi, Togetic, Togekiss (153)
Yanma, Yanmega (155)
Gligar, Gliscor (157)
Swinub, Piloswine, Mamoswine (160)
Houndour, Houndoom (162)
Ralts, Kirlia, Gardevoir, Gallade (166)
Nosepass, Probopass (168)
Swablu, Altaria (170)
Duskull, Dusclops (172)
Tropius (173)
Absol (174)
Snorunt, Glalie, Froslass (177)
Rotom (178)
Giratina (179)

Platinum's total is 179, up to 181 if you count Dialga and Palkia.
Final totals:
DP = 130 or 132/151
Platinum = 179 or 181/210

Now, moving on to the National Dex Pokémon.
First off, let us add back the Platinum dex additions back to DPPt so that we can be on the same page going forward.
The following Platinum additions are common to both Diamond/Pearl:

Starting count: 132
Magnemite, Magneton, Magnezone (135)
Lickitung, Lickilicky (137)
Rhyhorn, Rhydon (139)
Eevee, Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon (147)
Porygon (148)
Togepi, Togetic, Togekiss (151)
Yanma, Yanmega (153)
Swinub, Piloswine, Mamoswine (156)
Ralts, Kirlia, Gardevoir, Gallade (160)
Nosepass, Probopass (162)
Swablu, Altaria (164)
Duskull, Dusclops (166)
Absol (167)
Snorunt, Glalie, Froslass (170)
Rotom (171)
Giratina (172)

Diamond and Pearl each have a 172 total now. A couple of the Platinum additions were version-exclusives in Diamond/Pearl: Scyther to Diamond and Houndour & Houndoom to Pearl, putting our totals at:
Diamond - 173
Pearl - 174
Platinum - 181

Let's get into postgame. The following species are common to all three games:

Pidgey, Pidgeotto, Pidgeot (3)
Rattata, Raticate (5)
Spearow, Fearow (7)
Nidoran-F, Nidorina, Nidoqueen (10)
Nidoran-M, Nidorino, Nidoking (13)
Igglybuff, Jigglypuff, Wigglytuff (16)
Oddish, Gloom, Vileplume, Bellossom (20)
Paras, Parasect (22)
Venonat, Venomoth (24)
Diglett, Dugtrio (26)
Meowth, Persian (28)
Mankey, Primeape (30)
Poliwag, Poliwhirl, Poliwrath (33)
Bellsprout, Weepinbell, Victreebel (36)
Farfetch'd (37)
Doduo, Dodrio (39)
Grimer, Muk (41)
Shellder, Cloyster (43)
Drowzee, Hypno (45)
Krabby, Kingler (47)
Voltorb, Electrode (49)
Exeggcute, Exeggutor (51)
Cubone, Marowak (53)
Tyrogue, Hitmonlee, Hitmonchan, Hitmontop (57)
Koffing, Weezing (59)
Kangaskhan (60)
Horsea, Seadra (62)
Staryu, Starmie (64)
Smoochum, Jynx (66)
Tauros (67)
Lapras (68)
Ditto (69)
Omanyte, Omastar (71)
Kabuto, Kabutops (73)
Aerodactyl (74)
Dratini, Dragonair, Dragonite (77)

Sentret, Furret (79)
Ledyba, Ledian (81)
Spinarak, Ariados (83)
Chinchou, Lanturn (85)
Natu, Xatu (87)
Mareep, Flaaffy, Ampharos (90)
Hoppip, Skiploom, Jumpluff (93)
Sunkern, Sunflora (95)
Wynaut, Wobbuffet (97)
Dunsparce (98)
Snubbull, Granbull (100)
Qwilfish (101)
Slugma, Magcargo (103)
Corsola (104)
Delibird (105)
Skarmory (106)
Phanpy, Donphan (108)
Smeargle (109)
Miltank (110)

Zigzagoon, Linoone (112)
Taillow, Swellow (114)
Surskit, Masquerain (116)
Shroomish, Breloom (118)
Slakoth, Vigoroth, Slaking (121)
Nincada, Ninjask, Shedinja (124)
Whismur, Loudred, Exploud (127)
Makuhita, Hariyama (129)
Skitty, Delcatty (131)
Electrike, Manectric (133)
Plusle (134)
Minun (135)
Volbeat (136)
Illumise (137)
Gulpin, Swalot (139)
Carvanha, Sharpedo (141)
Wailmer, Wailord (143)
Numel, Camerupt (145)
Torkoal (146)
Spoink, Grumpig (148)
Spinda (149)
Cacnea, Cacturne (151)
Corphish, Crawdaunt (153)
Baltoy, Claydol (155)
Lileep, Cradily (157)
Anorith, Armaldo (159)
Castform (160)
Shuppet, Banette (162)
Relicanth (163)
Luvdisc (164)
Beldum, Metang, Metagross (167)

Heatran (168)
Cresselia (169)

Adding 169 to each of our totals before, we get:
Diamond - 342
Pearl - 343
Platinum - 350

Finally, a couple more version exclusives:

Diamond: 342 +
Seel, Dewgong (344)
Larvitar, Pupitar, Tyranitar (347)
Poochyena, Mightyena (349)
Aron, Lairon, Aggron (352)
Trapinch, Vibrava, Flygon (355)
Kecleon (356)
Clamperl (357)

Pearl: 343 +
Slowpoke, Slowbro (345)
Pinsir (346)
Stantler (347)
Trapinch, Vibrava, Flygon (350)
Spheal, Sealeo, Walrein (353)
Clamperl (354)
Bagon, Shelgon, Salamence (357)

Platinum: 350 +
Slowpoke, Slowbro (352)
Seel, Dewgong (354)
Pinsir (355)
Artiuno (356)
Zapdos (357)
Moltres (358)
Stantler (359)
Larvitar, Pupitar, Tyranitar (362)
Poochyena, Mightyena (365)
Aron, Lairon, Aggron (368)
Spheal, Sealeo, Walrein (371)
Bagon, Shelgon, Salamence (374)

This brings the final totals to:
Diamond/Pearl: 357
Platinum: 374

These numbers diverge from green_typhlosion's but I haven't looked at the numbers closely enough to figure out where the divergence happened. I'd be willing to bet it's due to another instance of missing version-exclusive trades or something. At any rate, my numbers match those on the Professor Oak Challenge guides for the games ( https://www.reddit.com/r/ProfessorOak/comments/bj6yeh ).

There are also a handful of Pokémon that can be obtained by slotting in a Gen 3 game and going to a specific route, listed below. I'm posting it for my own reference as much as anything, as you really can't get them without the appropriate gen 3 game lol (except Gengar, which you can obviously get via trade evo, but I included it here because if you had any gen 3 game you could technically get a Gengar without trading)

Caterpie, Metapod, Butterfree (FR) (3)
Weedle, Kakuna, Beedrill (LG) (6)
Ekans, Arbok (FR) (8)
Sandshrew, Sandslash (LG) (10)
Vulpix, Ninetales (LG) (12)
Growlithe, Arcanine (FR) (14)
Gengar (Any) (15)
Pineco, Forretress (E) (17)
Shuckle (E) (18)
Teddiursa, Ursaring (E) (20)
Lotad, Lombre, Ludicolo (S) (23)
Seedot, Nuzleaf, Shiftry (R) (26)
Sableye (S) (27)
Mawile (R) (28)
Zangoose (R) (29)
Seviper (S) (30)
Lunatone (S) (31)
Solrock (R) (32)

Diamond and Pearl also have Elekid (FR), Magby (LG), and Gligar (E); these were added to the expanded Pokédex in Platinum and thus the dongle method of getting them was removed.

As an aside: Regigigas is available in DPPt if you bring the 3 Regis, but they require you to transfer them from RSE. The Regis themselves are available in Platinum, but require you to bring a specific event Regigigas.
Additionally, Manaphy can be transferred from Pokémon Ranger and bred for Phione.

If you have access to Diamond, Pearl, and Platinum, but no Gen 3 games, your final total is (493 - Mew - Celebi - Jirachi - Deoxys - Phione - Manaphy - Shaymin - Darkrai - Arceus) = (484 - 9 Kanto starters - Mewtwo) = (474 - 9 Johto starters - 3 beasts - 2 birds) = (460 - 9 Hoenn starters - Regis - Latis - Weather Trio) = (443 - Caterpie line - Weedle line - Ekans line - Sandshrew line - Vulpix line - Growlithe line) = (429 - Pineco line - Shuckle - Teddiursa line) = (424 - Lotad line - Seedot line - Sableye - Mawile - Zangoose - Seviper - Lunatone - Solrock) = (412 - Regigigas) = 411.

I can and will finish this tomorrow but right now my brain's falling out

Altissimo · Dec 30, 2022

I was going to start working on the rest tbh but then I realized the professor oak guides have things more covered than I could lol

QuentinQuonce · Dec 30, 2022

Altissimo said:
Thanks for posting this! I'm really annoyed that no one else seems to want to compile this kind of information on their Pokémon websites in a clearly accessible manner.

I was working on effectively the same thing for my own purposes, and then this got bumped while I was busy working on, bringing it back to my attention. In reviewing, I've found a few discrepancies between my data and yours. I'd like to use this thread as a means to post my own data, as well as a few other numbers I collected - hope you don't mind.

The following spoiler contains a list of every Pokémon added in each game, along with a running total of a) the total number of Pokémon and b) the total number of Pokémon added by generation. In my calculations, I may refer to something like a game having access to "all of Gen 4's mons", in which case I refer to the specific list of "Pokémon added in gen 4" in the below spoiler. If I say "all of Gen 4's mons", it can also be assumed that any evolutionary relatives to a Gen 4 mon introduced in any game prior to Gen 4 are included by default, except in the following cases:

FRLG's pre-National dex does not count cross-gen relatives introduced after Gen 1, but they are available in the code & can be obtained within FRLG post-National dex

LGPE does not include cross-gen relatives introduced after Gen 1, full stop

BDSP does not include cross-gen relatives introduced after Gen 4, full stop

The number in parentheses is the running total.
Bulbasaur, Ivysaur, Venusaur (3)
Charmander, Charmeleon, Charizard (6)
Squirtle, Wartortle, Blastoise (9)
Caterpie, Metapod, Butterfree (12)
Weedle, Kakuna, Beedrill (15)
Pidgey, Pidgeotto, Pidgeot (18)
Rattata, Raticate (20)
Spearow, Fearow (22)
Ekans, Arbok (24)
Pikachu, Raichu (26)
Sandshrew, Sandslash (28)
Nidoran-F, Nidorina, Nidoqueen (31)
Nidoran-M, Nidorino, Nidoking (34)
Clefairy, Clefable (36)
Vulpix, Ninetales (38)
Jigglypuff, Wigglytuff (40)
Zubat, Golbat (42)
Oddish, Gloom, Vileplume (45)
Paras, Parasect (47)
Venonat, Venomoth (49)
Diglett, Dugtrio (51)
Meowth, Persian (53)
Psyduck, Golduck (55)
Mankey, Primeape (57)
Growlithe, Arcanine (59)
Poliwag, Poliwhirl, Politoed (62)
Abra, Kadabra, Alakazam (65)
Machop, Machoke, Machamp (68)
Bellsprout, Weepinbell, Victreebel (71)
Tentacool, Tentacruel (73)
Geodude, Graveler, Golem (76)
Ponyta, Rapidash (78)
Slowpoke, Slowbro (80)
Magnemite, Magneton (82)
Farfetch'd (83)
Doduo, Dodrio (85)
Seel, Dewgong (87)
Grimer, Muk (89)
Shellder, Cloyster (91)
Gastly, Haunter, Gengar (94)
Onix (95)
Drowzee, Hypno (97)
Krabby, Kingler (99)
Voltorb, Electrode (101)
Exeggcute, Exeggutor (103)
Cubone, Marowak (105)
Hitmonlee, Hitmonchan (107)
Lickitung (108)
Koffing, Weezing (110)
Rhyhorn, Rhydon (112)
Chansey (113)
Tangela (114)
Kangaskhan (115)
Horsea, Seadra (117)
Goldeen, Seaking (119)
Staryu, Starmie (121)
Mr. Mime (122)
Scyther (123)
Jynx (124)
Electabuzz (125)
Magmar (126)
Pinsir (127)
Tauros (128)
Magikarp, Gyarados (130)
Lapras (131)
Ditto (132)
Eevee, Vaporeon, Jolteon, Flareon (136)
Porygon (137)
Omanyte, Omastar (139)
Kabuto, Kabutops (141)
Aerodactyl (142)
Snorlax (143)
Articuno (144)
Zapdos (145)
Moltres (146)
Dratini, Dragonair, Dragonite (149)
Mewtwo (150)
Mew (151)

The first number is the overall running total. The second number is the running total of Pokémon added in this Gen.
Chikorita, Bayleef, Meganium (154) (3)
Cyndaquil, Quilava, Typhlosion (157) (6)
Totodile, Croconaw, Feraligatr (160) (9)
Sentret, Furret (162) (11)
Hoothoot, Noctowl (164) (13)
Ledyba, Ledian (166) (15)
Spinarak, Ariados (168) (17)
Crobat (169) (18)
Chinchou, Lanturn (171) (20)
Pichu (172) (21)
Cleffa (173) (22)
Igglybuff (174) (23)
Togepi, Togetic (176) (25)
Natu, Xatu (178) (27)
Mareep, Flaaffy, Ampharos (181) (30)
Bellossom (182) (31)
Marill, Azumarill (184) (33)
Sudowoodo (185) (34)
Politoed (186) (35)
Hoppip, Skiploom, Jumpluff (189) (38)
Aipom (190) (39)
Sunkern, Sunflora (192) (41)
Yanma (193) (42)
Wooper, Quagsire (195) (44)
Espeon, Umbreon (197) (46)
Murkrow (198) (47)
Slowking (199) (48)
Misdreavus (200) (49)
Unown (201) (50)
Wobbuffet (202) (51)
Girafarig (203) (52)
Pineco, Forretress (205) (54)
Dunsparce (206) (55)
Gligar (207) (56)
Steelix (208) (57)
Snubbull, Granbull (210) (59)
Qwilfish (211) (60)
Scizor (212) (61)
Shuckle (213) (62)
Heracross (214) (63)
Sneasel (215) (64)
Teddiursa, Ursaring (217) (66)
Slugma, Magcargo (219) (68)
Swinub, Piloswine (221) (70)
Corsola (222) (71)
Remoraid, Octillery (224) (73)
Delibird (225) (74)
Mantine (226) (75)
Skarmory (227) (76)
Houndour, Houndoom (229) (78)
Kingdra (230) (79)
Phanpy, Donphan (232) (81)
Porygon2 (233) (82)
Stantler (234) (83)
Smeargle (235) (84)
Tyrogue, Hitmontop (237) (86)
Smoochum (238) (87)
Elekid (239) (88)
Magby (240) (89)
Miltank (241) (90)
Blissey (242) (91)
Raikou (243) (92)
Entei (244) (93)
Suicune (245) (94)
Larvitar, Pupitar, Tyranitar (248) (97)
Lugia (249) (98)
Ho-Oh (250) (99)
Celebi (251) (100)

Gen 2 introduces 100 new Pokémon.

Treecko, Grovyle, Sceptile (254) (3)
Torchic, Combusken, Blaziken (257) (6)
Mudkip, Marshtomp, Swampert (260) (9)
Poochyena, Mightyena (262) (11)
Zigzagoon, Linoone (264) (13)
Wurmple, Silcoon, Beautifly, Cascoon, Dustox (269) (18)
Lotad, Lombre, Ludicolo (272) (21)
Seedot, Nuzleaf, Shiftry (275) (24)
Taillow, Swellow (277) (26)
Wingull, Pelipper (279) (28)
Ralts, Kirlia, Gardevoir (282) (31)
Surskit, Masquerain (284) (33)
Shroomish, Breloom (286) (35)
Slakoth, Vigoroth, Slaking (289) (38)
Nincada, Ninjask, Shedinja (292) (41)
Whismur, Loudred, Exploud (295) (44)
Makuhita, Hariyama (297) (46)
Azurill (298) (47)
Nosepass (299) (48)
Skitty, Delcatty (301) (50)
Sableye (302) (51)
Mawile (303) (52)
Aron, Lairon, Aggron (306) (55)
Meditite, Medicham (308) (57)
Electrike, Manectric (310) (59)
Plusle (311) (60)
Minun (312) (61)
Volbeat (313) (62)
Illumise (314) (63)
Roselia (315) (64)
Gulpin, Swalot (317) (66)
Carvanha, Sharpedo (319) (68)
Wailmer, Wailord (321) (70)
Numel, Camerupt (323) (72)
Torkoal (324) (73)
Spoink, Grumpig (326) (75)
Spinda (327) (76)
Trapinch, Vibrava, Flygon (330) (79)
Cacnea, Cacturne (332) (81)
Swablu, Altaria (334) (83)
Zangoose (335) (84)
Seviper (336) (85)
Lunatone (337) (86)
Solrock (338) (87)
Barboach, Whiscash (340) (89)
Corphish, Crawdaunt (342) (91)
Baltoy, Claydol (344) (93)
Lileep, Cradily (346) (95)
Anorith, Armaldo (348) (97)
Feebas, Milotic (350) (99)
Castform (351) (100)
Kecleon (352) (101)
Shuppet, Banette (354) (103)
Duskull, Dusclops (356) (105)
Tropius (357) (106)
Chimecho (358) (107)
Absol (359) (108)
Wynaut (360) (109)
Snorunt, Glalie (362) (111)
Spheal, Sealeo, Walrein (365) (114)
Clamperl, Huntail, Gorebyss (368) (117)
Relicanth (369) (118)
Luvdisc (370) (119)
Bagon, Shelgon, Salamence (373) (122)
Beldum, Metang, Metagross (376) (125)
Regirock (377) (126)
Regice (378) (127)
Registeel (379) (128)
Latias (380) (129)
Latios (381) (130)
Kyogre (382) (131)
Groudon (383) (132)
Rayquaza (384) (133)
Jirachi (385) (134)
Deoxys (386) (135)

Gen 3 introduces 135 new Pokémon.

Turtwig, Grotle, Torterra (389) (3)
Chimchar, Monferno, Infernape (392) (6)
Piplup, Prinplup, Empoleon (395) (9)
Starly, Staravia, Staraptor (398) (12)
Bidoof, Bibarel (400) (14)
Kricketot, Kricketune (402) (16)
Shinx, Luxio, Luxray (405) (19)
Budew, Roserade (407) (21)
Cranidos, Rampardos (409) (23)
Shieldon, Bastiodon (411) (25)
Burmy, Wormadam, Mothim (414) (28)
Combee, Vespiquen (416) (30)
Pachirisu (417) (31)
Buizel, Floatzel (419) (33)
Cherubi, Cherrim (421) (35)
Shellos, Gastrodon (423) (37)
Ambipom (424) (38)
Drifloon, Drifblim (426) (40)
Buneary, Lopunny (428) (42)
Mismagius (429) (43)
Honchkrow (430) (44)
Glameow, Purugly (432) (46)
Chingling (433) (47)
Stunky, Skuntank (435) (49)
Bronzor, Bronzong (437) (51)
Bonsly (438) (52)
Mime Jr. (439) (53)
Happiny (440) (54)
Chatot (441) (55)
Spiritomb (442) (56)
Gible, Gabite, Garchomp (445) (59)
Munchlax (446) (60)
Riolu, Lucario (448) (62)
Hippopotas, Hippowdon (450) (64)
Skorupi, Drapion (452) (66)
Croagunk, Toxicroak (454) (68)
Carnivine (455) (69)
Finneon, Lumineon (457) (71)
Mantyke (458) (72)
Snover, Abomasnow (460) (74)
Weavile (461) (75)
Magnezone (462) (76)
Lickilicky (463) (77)
Rhyperior (464) (78)
Tangrowth (465) (79)
Electivire (466) (80)
Magmortar (467) (81)
Togekiss (468) (82)
Yanmega (469) (83)
Leafeon, Glaceon (471) (85)
Gliscor (472) (86)
Mamoswine (473) (87)
Porygon-Z (474) (88)
Gallade (475) (89)
Probopass (476) (90)
Dusknoir (477) (91)
Froslass (478) (92)
Rotom (479) (93)
Uxie (480) (94)
Mesprit (481) (95)
Azelf (482) (96)
Dialga (482) (97)
Palkia (484) (98)
Heatran (485) (99)
Regigigas (486) (100)
Giratina (487) (101)
Cresselia (488) (102)
Phione (489) (103)
Manaphy (490) (104)
Darkrai (491) (105)
Shaymin (492) (106)
Arceus (492) (107)

Gen 4 introduces 107 new Pokémon.

I got the same numbers you did. This is the easiest generation to verify so I would hope we end up on the same page. However, I'd just like to use this place to post some additional data for my own benefit; namely, the math by which I arrive at the number and the total collection of Pokémon species available in each game, so that I can refer back to this in the future, and so it's easier for others to check my math.

All "Gen 1" families can be obtained across RGBY, if the player has access to multiple games & appropriate trading hardware. Mew is Event-exclusive, or Glitch-exclusive.

The following Pokémon are available to a single player in any copy of Red, Green, Blue, and Yellow (counted w/ a running total):

Caterpie, Metapod, Butterfree (3)
Pidgey, Pidgeotto, Pidgeot (6)
Rattata, Raticate (8)
Spearow, Fearow (10)
Pikachu (11)
Nidoran-F, Nidorina, Nidoqueen (14)
Nidoran-M, Nidorino, Nidoking (17)
Clefairy, Clefable (19)
Jigglypuff, Wigglytuff (21)
Zubat, Golbat (23)
Paras, Parasect (25)
Venonat, Venomoth (27)
Diglett, Dugtrio (29)
Psyduck, Golduck (31)
Poliwag, Poliwhirl, Poliwrath (34)
Abra, Kadabra (36)
Machop, Machoke (38)
Tentacool, Tentacruel (40)
Geodude, Graveler (42)
Ponyta, Rapidash (44)
Slowpoke, Slowbro (46)
Magnemite, Magneton (48)
Farfetch'd (49)
Doduo, Dodrio (51)
Seel, Dewgong (53)
Grimer, Muk (55)
Shellder, Cloyster (57)
Gastly, Haunter (59)
Onix (60)
Drowzee, Hypno (62)
Krabby, Kingler (64)
Voltorb, Electrode (66)
Exeggcute, Exeggutor (68)
Cubone, Marowak (70)
Lickitung (71)
Rhyhorn, Rhydon (73)
Chansey (74)
Tangela (75)
Kangaskhan (76)
Horsea, Seadra (78)
Goldeen, Seaking (80)
Staryu, Starmie (82)
Mr. Mime (83)
Tauros (84)
Magikarp, Gyarados (86)
Lapras (87)
Ditto (88)
Eevee (89)
Porygon (90)
Aerodactyl (91)
Snorlax (92)
Articuno (93)
Zapdos (94)
Moltres (95)
Dratini, Dragonair, Dragonite (98)
Mewtwo (99)

Each game begins with a base availability of 99 Pokémon.
RGB each get 1 starter, for an addition of 3. Yellow gets all 3 starters, for an addition of 9.
RGB = 102
Y = 108
RGB gets Raichu where Yellow does not.
RGB = 103
Y = 108
Each game gets 1 Fossil, with 2 Pokémon in its evolutionary line.
RGB = 105
Y = 110
Each game gets 1 Hitmon.
RGB = 106
Y = 111
Each game gets 1 Eeveelution.
RGB = 107
Y = 112
Next, each game gets version exclusive families.

Red: 107 +
Weedle, Kakuna, Beedrill (110)
Ekans, Arbok (112)
Oddish, Gloom, Vileplume (115)
Mankey, Primeape (117)
Growlithe, Arcanine (119)
Koffing, Weezing (121)
Scyther (122)
Jynx (123)
Electabuzz (124)

Green (which I use to refer to Japanese Green, which became International Blue; green_typhlosion refers to this as "Blue"): 107 +
Weedle, Kakuna, Beedrill (110)
Sandshrew, Sandslash (112)
Vulpix, Ninetales (114)
Meowth, Persian (116)
Bellsprout, Weepinbell, Victreebel (119)
Koffing, Weezing (121)
Jynx (122)
Magmar (123)
Pinsir (124)

Blue (which I use to refer to Japanese Blue; green_typhlosion refers to this as "Green"): 107 +
Weedle, Kakuna, Beedrill (110)
Sandshrew, Sandslash (112)
Oddish, Gloom, Vileplume (115)
Meowth, Persian (117)
Growlithe, Arcanine (119)
Koffing, Weezing (121)
Scyther (122)
Jynx (123)
Pinsir (124)

Yellow: 112 +
Sandshrew, Sandslash (114)
Vulpix, Ninetales (116)
Oddish, Gloom, Vileplume (119)
Mankey, Primeape (121)
Bellsprout, Weepinbell, Victreebel (124)
Scyther (125)
Pinsir (126)

Totals after version exclusives:
RGB = 124
Y = 126
Then, a few Pokémon that can only be obtained via trade evolution can be obtained via in-game trade.
Yellow gets Machamp.
RGB = 124
Y = 127
Blue gets Golem and Gengar.
RG = 124
B = 126
Y = 127

With only access to RBGY and no other games, you can get 150 Pokémon with the exception of Mew.

The following Pokémon are available to a single player in any one copy of Gold, Silver, or Crystal (and note I will be combining cross-gen evolutionary relatives for readability's sake):

Caterpie, Metapod, Butterfree (3)
Weedle, Kakuna, Beedrill (6)
Pidgey, Pidgeotto, Pidgeot (9)
Rattata, Raticate (11)
Spearow, Fearow (13)
Ekans, Arbok (15)
Pichu, Pikachu (17)
Sandshrew, Sandslash (19)
Nidoran-F, Nidorina, Nidoqueen (22)
Nidoran-M, Nidorino, Nidoking (25)
Cleffa, Clefairy, Clefable (28)
Igglybuff, Jigglypuff, Wigglytuff (31)
Zubat, Golbat, Crobat (34)
Oddish, Gloom, Bellossom (37)
Paras, Parasect (39)
Venonat, Venomoth (41)
Diglett, Dugtrio (43)
Psyduck, Golduck (45)
Poliwag, Poliwhirl (47)
Abra, Kadabra (49)
Machop, Machoke (51)
Bellsprout, Weepinbell (53)
Tentacool, Tentacruel (55)
Geodude, Graveler (57)
Ponyta, Rapidash (59)
Slowpoke, Slowbro (61)
Magnemite, Magneton (63)
Farfetch'd (64)
Doduo, Dodrio (66)
Seel, Dewgong (68)
Grimer, Muk (70)
Shellder (71)
Gastly, Haunter (73)
Onix (74)
Drowzee, Hypno (76)
Krabby, Kingler (78)
Voltorb, Electrode (80)
Exeggcute (81)
Cubone, Marowak (83)
Tyrogue, Hitmonlee, Hitmonchan, Hitmontop (87)
Lickitung (88)
Koffing, Weezing (90)
Rhyhorn, Rhydon (92)
Chansey, Blissey (94)
Tangela (95)
Kangaskhan (96)
Horsea, Seadra (98)
Goldeen, Seaking (100)
Staryu (101)
Mr. Mime (102)
Scyther (103)
Smoochum, Jynx (105)
Elekid, Electabuzz (107)
Magby, Magmar (109)
Pinsir (110)
Tauros (111)
Magikarp, Gyarados (113)
Lapras (114)
Ditto (115)
Eevee, Espeon, Umbreon (118)
Porygon (119)
Aerodactyl (120)
Snorlax (121)
Dratini, Dragonair, Dragonite (124)

Sentret, Furret (126)
Hoothoot, Noctowl (128)
Chinchou, Lanturn (130)
Togepi, Togetic (132)
Natu, Xatu (134)
Marill, Azumarill (136)
Sudowoodo (137)
Hoppip, Skiploom, Jumpluff (140)
Aipom (141)
Sunkern, Sunflora (143)
Yanma (144)
Wooper, Quagsire (146)
Murkrow (147)
Misdreavus (148)
Unown (149)
Wobbuffet (150)
Pineco, Forretress (152)
Dunsparce (153)
Snubbull, Granbull (155)
Qwilfish (156)
Shuckle (157)
Heracross (158)
Sneasel (159)
Slugma, Magcargo (161)
Swinub, Piloswine (163)
Corsola (164)
Houndour, Houndoom (166)
Stantler (167)
Smeargle (168)
Miltank (169)
Raikou (170)
Entei (171)
Suicune (172)
Larvitar, Pupitar, Tyranitar (175)
Lugia (176)
Ho-Oh (177)

Each game gets 1 starter for 3 additional entries, putting the count at 180. After that, we have version exclusives.

Gold: 180 +
Mankey, Primeape (182)
Growlithe (183)
Spinarak, Ariados (185)
Mareep, Flaaffy, Ampharos (188)
Girafarig (189)
Gligar (190)
Teddiursa, Ursaring (192)
Remoraid, Octillery (194)
Mantine (195)

Silver: 180 +
Vulpix (181)
Meowth, Persian (183)
Ledyba, Ledian (185)
Mareep, Flaaffy, Ampharos (188)
Girafarig (189)
Remoraid, Octillery (191)
Delibird (192)
Skarmory (193)
Phanpy, Donphan (195)

Crystal: 180 +
Meowth, Persian (182)
Growlithe (183)
Ledyba, Ledian (185)
Spinarak, Ariados (187)
Gligar (188)
Teddiursa, Ursaring (190)
Delibird (191)
Mantine (192)
Skarmory (193)
Phanpy, Donphan (195)

They are all tied at 195. But wait - Zilche pointed out the problem with the lack of evolutionary stones in GSC. If you look at my previous lists, you'll notice I've excluded every evolution from Fire Stone, Thunderstone, Leaf Stone, or Water Stone. Sun Stones and Moon Stones have infinite sources, so their evolutions are included.
Vanilla GS, without use of Mystery Gift, have access to only one of each Stone. Crystal, however, adds Pokegear numbers to get multiple Stones. So keeping this in mind, we can add 4 to each of Gold and Silver (one for each Stone) which you can use on any Pokémon that evolves via Stone. This puts GS at 199. Crystal gets a few more:
Growlithe, Eevee (2)
Poliwrath, Shellder, Staryu, Eevee (6)
Pikachu, Eevee (8)
Gloom, Weepinbell, Exeggcute (11)
for a total of 206, or 207 if Celebi is included. The number for Crystal is the same as green_typhlosion's, but Gold and Silver take a slight hit due to the lack of appropriate stones.

With only access to GSC and no other games, you can get (251 - 9 Kanto starters - 4 Kanto fossils - 4 Kanto legendaries - Mew - Celebi) 232 Pokémon of the total 251, or 233 if you include Celebi.

This is where I take a slightly different interest in the data, because this is the first game with a regional dex!
What I'm going to do here is both post the game's regional dex's families, and then calculate how many Pokémon the game can get both out of the regional total and the national total. With RS that thankfully isn't too annoying since RS doesn't include any Pokémon that aren't in its regional dex, but starting with Emerald (and continuing basically until Dexit) every game to follow does have Pokémon from the national dex as well.

Here are the Pokémon in the Hoenn Regional Dex:

All Gen 3 Families are included for a total of 135 mons.
Other families:
Pichu, Pikachu, Raichu (138)
Sandshrew, Sandslash (140)
Vulpix, Ninetales (142)
Igglybuff, Jigglypuff, Wigglytuff (145)
Zubat, Golbat, Crobat (148)
Oddish, Gloom, Vileplume, Bellossom (152)
Psyduck, Golduck (154)
Abra, Kadabra, Alakazam (157)
Machop, Machoke, Machamp (160)
Tentacool, Tentacruel (162)
Geodude, Graveler, Golem (165)
Magnemite, Magneton (167)
Doduo, Dodrio (169)
Grimer, Muk (171)
Voltorb, Electrode (173)
Koffing, Weezing (175)
Rhyhorn, Rhydon (177)
Horsea, Seadra, Kingdra (180)
Goldeen, Seaking (182)
Staryu, Starmie (184)
Pinsir (185)
Magikarp, Gyarados (187)

Chinchou, Lanturn (189)
Natu, Xatu (191)
Marill, Azumarill (193)
Wobbuffet (194)
Girafarig (195)
Heracross (196)
Slugma, Magcargo (198)
Corsola (199)
Skarmory (200)
Phanpy, Donphan (202)

There are a total of 202 species in the Hoenn Dex, or 200 if you discount Jirachi and Deoxys.

The following are available to any one copy of Ruby, Sapphire, or Emerald:

Pichu, Pikachu, Raichu (3)
Sandshrew, Sandslash (5)
Vulpix, Ninetales (7)
Igglybuff, Jigglypuff (9)
Zubat, Golbat, Crobat (12)
Oddish, Gloom, Vileplume, Bellossom (16)
Psyduck, Golduck (18)
Abra, Kadabra (20)
Machop, Machoke (22)
Tentacool, Tentacruel (24)
Geodude, Graveler (26)
Magnemite, Magneton (28)
Doduo, Dodrio (30)
Grimer, Muk (32)
Voltorb, Electrode (34)
Koffing, Weezing (36)
Rhyhorn, Rhydon (38)
Horsea, Seadra (40)
Goldeen, Seaking (42)
Staryu, Starmie (44)
Pinsir (45)
Magikarp, Gyarados (47)

Chinchou, Lanturn (49)
Natu, Xatu (51)
Azurill, Marill, Azumarill (54)
Wynaut, Wobbuffet (56)
Girafarig (57)
Heracross (58)
Slugma, Magcargo (60)
Corsola (61)
Skarmory (62)
Phanpy, Donphan (64)

Poochyena, Mightyena (66)
Zigzagoon, Linoone (68)
Wurmple, Silcoon, Beautifly, Cascoon, Dustox (73)
Taillow, Swellow (75)
Wingull, Pelipper (77)
Ralts, Kirlia, Gardevoir (80)
Shroomish, Breloom (82)
Slakoth, Vigoroth, Slaking (85)
Nincada, Ninjask, Shedinja (88)
Whismur, Loudred, Exploud (91)
Makuhita, Hariyama (93)
Nosepass (94)
Skitty (95)
Aron, Lairon, Aggron (98)
Electrike, Manectric (100)
Plusle (101)
Minun (102)
Volbeat (103)
Illumise (104)
Gulpin, Swalot (106)
Carvanha, Sharpedo (108)
Wailmer, Wailord (110)
Numel, Camerupt (112)
Torkoal (113)
Spoink, Grumpig (115)
Spinda (116)
Trapinch, Vibrava, Flygon (119)
Cacnea, Cacturne (121)
Swablu, Altaria (123)
Barboach, Whiscash (125)
Corphish, Crawdaunt (127)
Baltoy, Claydol (129)
Feebas, Milotic (131)
Castform (132)
Kecleon (133)
Shuppet, Banette (135)
Duskull, Dusclops (137)
Tropius (138)
Chimecho (139)
Absol (140)
Snorunt, Glalie (142)
Spheal, Sealeo, Walrein (145)
Clamperl (146)
Relicanch (147)
Luvdisc (148)
Bagon, Shelgon, Salamence (151)
Beldum, Metang, Metagross (154)
Regirock (155)
Regice (156)
Registeel (157)
Rayquaza (158)

Each game starts with a 158 base.
Each game gets 1 starter for 3 extra entries, putting the total at 161.
Ruby and Sapphire get 1 Fossil for 2 entries, while Emerald gets both for 4, putting us at:
RS - 163
E - 165
Each game gets one Lati:
RS - 164
E- 166
Now for version exclusives:

Ruby: 164 +
Seedot, Nuzleaf, Shiftry (167)
Surskit, Masquerain (169)
Mawile (170)
Meditite, Medicham (172)
Roselia (173)
Zangoose (174)
Solrock (175)
Groudon (176)

Sapphire: 164 +
Lotad, Lombre, Ludicolo (167)
Surskit, Masquerain (169)
Sableye (170)
Meditite, Medicham (172)
Roselia (173)
Seviper (174)
Lunatone (175)
Kyogre (176)

Emerald: 166 +
Lotad, Lombre, Ludicolo (169)
Seedot, Nuzleaf, Shiftry (172)
Sableye (173)
Mawile (174)
Seviper (175)
Solrock (176)
Kyogre, Groudon (178)

Totals: 176, 176, and 178. But as DrPumpkinz pointed out, Ruby and Emerald both have only one natural Moon Stone, and two Pokémon that evolve with it. So we can add 1 Moon Stone mon to Ruby and Emerald, and 2 to Sapphire, for the following regional dex totals -
Ruby: 177
Sapphire: 178
Emerald: 179
This is actually a different number than green_typhlosion ended up with, and I think I know why: they report that Emerald is missing "7 Pokémon instead of 8", but that's not actually true - it's still 8 when you consider that Emerald can only get one of the Lati's. In fact, Ruby and Emerald have the same availability between version-exclusives and Moon Stones - the 2-mon difference here is because of Emerald's ability to get an extra Fossil.

Moving on to the Emerald additions. Emerald adds the following families:

Keeping a running total of additions as well.
179 +
Meowth, Persian (181) (2)
Ditto (182) (3)
Hoothoot, Noctowl (184) (5)
Ledyba, Ledian (186) (7)
Spinarak, Ariados (188) (9)
Mareep, Flaaffy, Ampharos (191) (12)
Sudowoodo (192) (13)
Aipom (193) (14)
Sunkern, Sunflora (195) (16) (Emerald has access to a second Sun Stone via wild Solrock)
Wooper, Quagsire (197) (18)
Pineco, Forretress (199) (20)
Gligar (200) (21)
Snubbull, Granbull (202) (23)
Shuckle (203) (24)
Teddiursa, Ursaring (205) (26)
Remoraid, Octillery (207) (28)
Houndour, Houndoom (209) (30)
Stantler (210) (31)
Smeargle (211) (32)
Miltank (212) (33)

Emerald's final count is 212 of the 386 in the National Dex.

With only access to RSE and no other games, you can get up to 233 National Dex Pokémon (200 Hoenn Dex + 33 Emerald additions), or as many as 242 if you're able to complete the Hoenn Dex on Emerald three times to get each of the Johto starters.

Like green_typhlosion said, verifying some info for FRLG is difficult lol

The Kanto Dex used in this game retains the same species from Gen 1 - no cross-evolutions are available - putting us back at 150 or 151.
Another slightly odd point I should make is that it's now possible to get both Hitmon forms and all Eevee evolutions with breeding, but breeding doesn't open up until you've already gotten the national dex. Thus I'll be ignoring the existence of breeding for the regional dex calculations, but adding it to the national dex calcs. If you want to count the other Hitmon and the other two Eevee evolutions, just add +3 to the final regional total.

Caterpie, Metapod, Butterfree (3)
Weedle, Kakuna, Beedrill (6)
Pidgey, Pidgeotto, Pidgeot (9)
Rattata, Raticate (11)
Spearow, Fearow (13)
Pikachu, Raichu (15)
Nidoran-F, Nidorina, Nidoqueen (18)
Nidoran-M, Nidorino, Nidoking (21)
Clefairy, Clefable (23)
Jigglypuff, Wigglytuff (25)
Zubat, Golbat (27)
Paras, Parasect (29)
Venonat, Venomoth (31)
Diglett, Dugtrio (33)
Meowth, Persian (35)
Mankey, Primeape (37)
Poliwag, Poliwhirl, Poliwrath (40)
Abra, Kadabra (42)
Machop, Machoke (44)
Tentacool, Tentacruel (46)
Geodude, Graveler (48)
Ponyta, Rapidash (50)
Magnemite, Magneton (52)
Farfetch'd (53)
Doduo, Dodrio (55)
Seel, Dewgong (57)
Grimer, Muk (59)
Gastly, Haunter (61)
Onix (62)
Drowzee, Hypno (64)
Krabby, Kingler (66)
Voltorb, Electrode (68)
Exeggcute, Exeggutor (70)
Cubone, Marowak (72)
Lickitung (73)
Koffing, Weezing (75)
Rhyhorn, Rhydon (77)
Chansey (78)
Tangela (79)
Kangaskhan (80)
Horsea, Seadra (82)
Goldeen, Seaking (84)
Mr. Mime (85)
Jynx (86)
Tauros (87)
Magikarp, Gyarados (89)
Lapras (90)
Ditto (91)
Eevee (92)
Porygon (93)
Aerodactyl (94)
Snorlax (95)
Articuno (96)
Zapdos (97)
Moltres (98)
Dratini, Dragonair, Dragonite (101)
Mewtwo (102)

Each game has a base availability of 102.
Add 1 starter for 105.
Add 1 fossil for 107.
Add 1 Eeveelution for 108.
Add 1 Hitmon for 109.
Next, the version exclusives.

FR: 109 +
Ekans, Arbok (111)
Oddish, Gloom, Vileplume (114)
Psyduck, Golduck (116)
Growlithe, Arcanine (118)
Shellder, Cloyster (120)
Scyther (121)
Electabuzz (122)

LG: 109 +
Sandshrew, Sandslash (111)
Vulpix, Ninetales (113)
Bellsprout, Weepinbell, Victreebel (116)
Slowpoke, Slowbro (118)
Staryu, Starmie (120)
Magmar (121)
Pinsir (122)

Within just the regional dex, each game has access to 122 of 150/151 Pokémon. The number is slightly smaller than the originals due to a slightly larger number of version-exclusives.

Now moving on to the National Dex. As stated before, this gives you the ability to breed, giving you access to another Hitmon + Eevee for a total of 125. In addition, you can now get the following evolutionary relatives of Gen 1 Pokémon:

125 +
Pichu (126)
Cleffa (127)
Igglybuff (128)
Crobat (129)
Tyrogue, Hitmontop (131)
Blissey (132)
Smoochum (133)

The total here is 133 across games. There are also 3 cross-gen evos that are version exclusive: Bellossom and Elekid to FR and Magby to LG, putting us at 135 for FR and 134 for LG.

Now, moving on to the added National Dex Pokémon. I'll just keep a total of these by themselves since FR and LG's totals have already diverged.

Sentret, Furret (2)
Ledyba, Ledian (4)
Spinarak, Ariados (6)
Togepi, Togetic (8)
Natu, Xatu (10)
Hoppip, Skiploom, Jumpluff (13)
Yanma (14)
Unown (15)
Wynaut, Wobbuffet (17)
Dunsparce (18)
Heracross (19)
Slugma, Magcargo (21)
Swinub, Piloswine (23)
Phanpy, Donphan (25)
Larvitar, Pupitar, Tyranitar (28)

The total now is 163 for FR and 162 for LG.
Each game can also get 1 Johto Beast dependent on their starter, bringing the total to 164 for FR and 163 for LG.

Moving on to newly-added version exclusives:

FR: 164 +
Wooper, Quagsire (166)
Murkrow (167)
Qwilfish (168)
Delibird (169)
Skarmory (170)

LG: 163 +
Azurill, Marill, Azumarill (166)
Misdreavus (167)
Sneasel (168)
Remoraid, Octillery (170)
Mantine (171)

The final total is 170 for FR and 171 for LG. This differs from green_typhlosion's count by 1, which I think can be explained by their saying that "FR has 23 missing Pokémon while LG has 22" - while technically true, I think what happened is they failed to take into account that one of these exclusives is Scizor and another is Slowking, which require trading.

If you have access to just FRLG and no other games, your total National Dex number is (150 + 16 cross-gen Pokémon (including trade evolutions) + 28 Johto additions + 14 version-exclusive Johto additions + 3 Johto beasts) = 211.

Everyone who was around when DP was released knows that DP contained every non-legendary and non-starter except for Tangela and Tropius, which were added in Platinum. That makes the numbers a little easier, but I'm still going to use additive math here because I want to be consistent & have this as a resource for myself.

DPPt had a total of 493 Pokémon available, but the first Sinnoh Dex in DPP contained 151 of them.

Pichu, Pikachu, Raichu (3)
Cleffa, Clefairy, Clefable (6)
Zubat, Golbat, Crobat (9)
Psyduck, Golduck (11)
Abra, Kadabra, Alakazam (14)
Machop, Machoke, Machamp (17)
Tentacool, Tentacruel (19)
Geodude, Graveler, Golem (22)
Ponyta, Rapidash (24)
Gastly, Haunter, Gengar (27)
Onix, Steelix (29)
Happiny, Chansey, Blissey (32)
Goldeen, Seaking (34)
Mime Jr., Mr. Mime (36)
Magikarp, Gyarados (38)
Munchlax, Snorlax (40)

Hoothoot, Nocrowl (42)
Azurill, Marill, Azumarill (45)
Bonsly, Sudowoodo (47)
Aipom, Ambipom (49)
Wooper, Quagsire (51)
Murkrow, Honchkrow (53)
Misdreavus, Mismagius (55)
Unown (56)
Girafarig (57)
Heracross (58)
Sneasel, Weavile (60)
Remoraid, Octillery (62)
Mantyke, Mantine (64)

Wurmple, Silcoon, Beautifly, Cascoon, Dustox (69)
Wingull, Pelipper (71)
Meditite, Medicham (73)
Budew, Roselia, Roserade (76)
Barboach, Whiscash (78)
Feebas, Milotic (80)
Chingling, Chimecho (82)

Turtwig, Grotle, Torterra (85)
Chimchar, Monferno, Infernape (88)
Piplup, Prinplup, Empoleon (91)
Starly, Staravia, Staraptor (94)
Bidoof, Bibarel (96)
Kricketot, Kricketune (98)
Shinx, Luxio, Luxray (101)
Cranidos, Rampardos (103)
Shieldon, Bastiodon (105)
Burmy, Wormadam, Mothim (108)
Combee, Vespiquen (110)
Pachirisu (111)
Buizel, Floatzel (113)
Cherubi, Cherrim (115)
Shellos, Gastrodon (117)
Drifloon, Drifblim (119)
Buneary, Lopunny (121)
Glameow, Honchkrow (123)
Stunky, Skuntank (125)
Bronzor, Bronzong (127)
Chatot (128)
Spiritomb (129)
Gible, Gabite, Garchomp (132)
Riolu, Lucario (134)
Hippopotas, Hippowdon (136)
Skorupi, Drapion (138)
Croagunk, Toxicroak (140)
Carnivine (141)
Finneon, Lumineon (143)
Snover, Abomasnow (145)
Uxie (146)
Mesprit (147)
Azelf (148)
Dialga (149)
Palkia (150)
Manaphy (151)

Platinum uses this same dex, but adds 59 additional species:

151 +
Magnemite, Magneton, Magnezone (154)
Lickitung, Lickilicky (156)
Rhyhorn, Rhydon, Rhyperior (159)
Tangela, Tangrowth (161)
Eevee, Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon (169)
Scyther, Scizor (171)
Elekid, Electabuzz, Electivire (174)
Magby, Magmar, Magmortar (177)
Porygon, Porygon2, Porygon-Z (180)

Togepi, Togetic, Togekiss (183)
Yanma, Yanmega (185)
Gligar, Gliscor (187)
Swinub, Piloswine, Mamoswine (190)
Houndour, Houndoom (192)

Ralts, Kirlia, Gardevoir, Gallade (196)
Nosepass, Probopass (198)
Swablu, Altaria (200)
Duskull, Dusclops, Dusknoir (203)
Tropius (204)
Absol (205)
Snorunt, Glalie, Froslass (208)

Rotom (209)
Giratina (210)

Here are the common species across DPPt:

Pichu, Pikachu, Raichu (3)
Cleffa, Clefairy, Clefable (6)
Zubat, Golbat, Crobat (9)
Psyduck, Golduck (11)
Abra, Kadabra (13)
Machop, Machoke (15)
Tentacool, Tentacruel (17)
Geodude, Graveler (19)
Ponyta, Rapidash (21)
Gastly, Haunter (23)
Onix, Steelix (25)
Happiny, Chansey, Blissey (28)
Goldeen, Seaking (30)
Magikarp, Gyarados (32)
Munchlax, Snorlax (34)
Hoothoot, Noctowl (36)
Azurill, Marill, Azumarill (39)
Aipom, Ambipom (41)
Wooper, Quagsire (43)
Unown (44)
Girafarig (45)
Heracross (46)
Sneasel, Weavile (48)
Remoraid, Octillery (50)
Mantyke, Mantine (52)
Wurmple, Silcoon, Beautifly, Cascoon, Dustox (57)
Wingull, Pelipper (59)
Meditite, Medicham (61)
Budew, Roselia, Roserade (64)
Barboach, Whiscash (66)
Feebas, Milotic (68)
Chingling, Chimecho (70)
Starly, Staravia, Staraptor (73)
Bidoof, Bibarel (75)
Kricketot, Kricketune (77)
Shinx, Luxio, Luxray (80)
Burmy, Wormadam, Mothim (83)
Combee, Vespiquen (85)
Pachirisu (86)
Buizel, Floatzel (88)
Cherubi, Cherrim (90)
Shellos, Gastrodon (92)
Drifloon, Drifblim (94)
Buneary, Lopunny (96)
Bronzor, Bronzong (98)
Chatot (99)
Gible, Gabite, Garchomp (102)
Riolu, Lucario (104)
Hippopotas, Hippowdon (106)
Skorupi, Drapion (108)
Croagunk, Toxicroak (110)
Carnivine (111)
Finneon, Lumineon (113)
Snover, Abomasnow (115)
Uxie (116)
Mesprit (117)
Azelf (118)

All three games have a base of 118 Pokémon.
Add 1 starter for 3 entries, to 121.
Add 1 fossil for 2 entries, to 123. Platinum has access to both fossils but can only get one of the two in any given save file, so I'm including it here.
Add the following version exclusives (subtracting the fossil):

Diamond: 123 +
Mime Jr., Mr. Mime (125)
Murkrow, Honchkrow (127)
Stunky, Skuntank (129)
Dialga (130)

Pearl: 123 +
Bonsly, Sudowoodo (125)
Misdreavus, Mismagius (127)
Stunky, Skuntank (129)
Palkia (130)

For Pokémon shared between all 3 games, Diamond and Pearl's final count is 130, which is actually greater than Platinum's 127. You can get Mime Jr. and Bonsly (normally version exclusives) in the updated Trophy Garden once you get the National Dex, so the total jumps to 132 for both games if you include that. We're not done adding entries to Platinum, yet, but also, you may notice I didn't add Dialga and Palkia to Platinum's count in the version exclusives spoiler. The reason for this is because, while both are available, they can't be accessed until the postgame, so I'll be waiting to add them until after adding Platinum's additions (as I did with the breedable Pokémon in FRLG).

Platinum's additions add the following:

127 +
Magnemite, Magneton, Magnezone (130)
Lickitung, Lickilicky (132)
Rhyhorn, Rhydon (134)
Tangela, Tangrowth (136)
Eevee, Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon (144)
Scyther (145)
Elekid, Electabuzz (147)
Magby, Magmar (149)
Porygon (150)
Togepi, Togetic, Togekiss (153)
Yanma, Yanmega (155)
Gligar, Gliscor (157)
Swinub, Piloswine, Mamoswine (160)
Houndour, Houndoom (162)
Ralts, Kirlia, Gardevoir, Gallade (166)
Nosepass, Probopass (168)
Swablu, Altaria (170)
Duskull, Dusclops (172)
Tropius (173)
Absol (174)
Snorunt, Glalie, Froslass (177)
Rotom (178)
Giratina (179)

Platinum's total is 179, up to 181 if you count Dialga and Palkia.
Final totals:
DP = 130 or 132/151
Platinum = 179 or 181/210

Now, moving on to the National Dex Pokémon.
First off, let us add back the Platinum dex additions back to DPPt so that we can be on the same page going forward.
The following Platinum additions are common to both Diamond/Pearl:

Starting count: 132
Magnemite, Magneton, Magnezone (135)
Lickitung, Lickilicky (137)
Rhyhorn, Rhydon (139)
Eevee, Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon (147)
Porygon (148)
Togepi, Togetic, Togekiss (151)
Yanma, Yanmega (153)
Swinub, Piloswine, Mamoswine (156)
Ralts, Kirlia, Gardevoir, Gallade (160)
Nosepass, Probopass (162)
Swablu, Altaria (164)
Duskull, Dusclops (166)
Absol (167)
Snorunt, Glalie, Froslass (170)
Rotom (171)
Giratina (172)

Diamond and Pearl each have a 172 total now. A couple of the Platinum additions were version-exclusives in Diamond/Pearl: Scyther to Diamond and Houndour & Houndoom to Pearl, putting our totals at:
Diamond - 173
Pearl - 174
Platinum - 181

Let's get into postgame. The following species are common to all three games:

Pidgey, Pidgeotto, Pidgeot (3)
Rattata, Raticate (5)
Spearow, Fearow (7)
Nidoran-F, Nidorina, Nidoqueen (10)
Nidoran-M, Nidorino, Nidoking (13)
Igglybuff, Jigglypuff, Wigglytuff (16)
Oddish, Gloom, Vileplume, Bellossom (20)
Paras, Parasect (22)
Venonat, Venomoth (24)
Diglett, Dugtrio (26)
Meowth, Persian (28)
Mankey, Primeape (30)
Poliwag, Poliwhirl, Poliwrath (33)
Bellsprout, Weepinbell, Victreebel (36)
Farfetch'd (37)
Doduo, Dodrio (39)
Grimer, Muk (41)
Shellder, Cloyster (43)
Drowzee, Hypno (45)
Krabby, Kingler (47)
Voltorb, Electrode (49)
Exeggcute, Exeggutor (51)
Cubone, Marowak (53)
Tyrogue, Hitmonlee, Hitmonchan, Hitmontop (57)
Koffing, Weezing (59)
Kangaskhan (60)
Horsea, Seadra (62)
Staryu, Starmie (64)
Smoochum, Jynx (66)
Tauros (67)
Lapras (68)
Ditto (69)
Omanyte, Omastar (71)
Kabuto, Kabutops (73)
Aerodactyl (74)
Dratini, Dragonair, Dragonite (77)

Sentret, Furret (79)
Ledyba, Ledian (81)
Spinarak, Ariados (83)
Chinchou, Lanturn (85)
Natu, Xatu (87)
Mareep, Flaaffy, Ampharos (90)
Hoppip, Skiploom, Jumpluff (93)
Sunkern, Sunflora (95)
Wynaut, Wobbuffet (97)
Dunsparce (98)
Snubbull, Granbull (100)
Qwilfish (101)
Slugma, Magcargo (103)
Corsola (104)
Delibird (105)
Skarmory (106)
Phanpy, Donphan (108)
Smeargle (109)
Miltank (110)

Zigzagoon, Linoone (112)
Taillow, Swellow (114)
Surskit, Masquerain (116)
Shroomish, Breloom (118)
Slakoth, Vigoroth, Slaking (121)
Nincada, Ninjask, Shedinja (124)
Whismur, Loudred, Exploud (127)
Makuhita, Hariyama (129)
Skitty, Delcatty (131)
Electrike, Manectric (133)
Plusle (134)
Minun (135)
Volbeat (136)
Illumise (137)
Gulpin, Swalot (139)
Carvanha, Sharpedo (141)
Wailmer, Wailord (143)
Numel, Camerupt (145)
Torkoal (146)
Spoink, Grumpig (148)
Spinda (149)
Cacnea, Cacturne (151)
Corphish, Crawdaunt (153)
Baltoy, Claydol (155)
Lileep, Cradily (157)
Anorith, Armaldo (159)
Castform (160)
Shuppet, Banette (162)
Relicanth (163)
Luvdisc (164)
Beldum, Metang, Metagross (167)

Heatran (168)
Cresselia (169)

Adding 169 to each of our totals before, we get:
Diamond - 342
Pearl - 343
Platinum - 350

Finally, a couple more version exclusives:

Diamond: 342 +
Seel, Dewgong (344)
Larvitar, Pupitar, Tyranitar (347)
Poochyena, Mightyena (349)
Aron, Lairon, Aggron (352)
Trapinch, Vibrava, Flygon (355)
Kecleon (356)
Clamperl (357)

Pearl: 343 +
Slowpoke, Slowbro (345)
Pinsir (346)
Stantler (347)
Trapinch, Vibrava, Flygon (350)
Spheal, Sealeo, Walrein (353)
Clamperl (354)
Bagon, Shelgon, Salamence (357)

Platinum: 350 +
Slowpoke, Slowbro (352)
Seel, Dewgong (354)
Pinsir (355)
Artiuno (356)
Zapdos (357)
Moltres (358)
Stantler (359)
Larvitar, Pupitar, Tyranitar (362)
Poochyena, Mightyena (365)
Aron, Lairon, Aggron (368)
Spheal, Sealeo, Walrein (371)
Bagon, Shelgon, Salamence (374)

This brings the final totals to:
Diamond/Pearl: 357
Platinum: 374

These numbers diverge from green_typhlosion's but I haven't looked at the numbers closely enough to figure out where the divergence happened. I'd be willing to bet it's due to another instance of missing version-exclusive trades or something. At any rate, my numbers match those on the Professor Oak Challenge guides for the games ( https://www.reddit.com/r/ProfessorOak/comments/bj6yeh ).

There are also a handful of Pokémon that can be obtained by slotting in a Gen 3 game and going to a specific route, listed below. I'm posting it for my own reference as much as anything, as you really can't get them without the appropriate gen 3 game lol (except Gengar, which you can obviously get via trade evo, but I included it here because if you had any gen 3 game you could technically get a Gengar without trading)

Caterpie, Metapod, Butterfree (FR) (3)
Weedle, Kakuna, Beedrill (LG) (6)
Ekans, Arbok (FR) (8)
Sandshrew, Sandslash (LG) (10)
Vulpix, Ninetales (LG) (12)
Growlithe, Arcanine (FR) (14)
Gengar (Any) (15)
Pineco, Forretress (E) (17)
Shuckle (E) (18)
Teddiursa, Ursaring (E) (20)
Lotad, Lombre, Ludicolo (S) (23)
Seedot, Nuzleaf, Shiftry (R) (26)
Sableye (S) (27)
Mawile (R) (28)
Zangoose (R) (29)
Seviper (S) (30)
Lunatone (S) (31)
Solrock (R) (32)

Diamond and Pearl also have Elekid (FR), Magby (LG), and Gligar (E); these were added to the expanded Pokédex in Platinum and thus the dongle method of getting them was removed.

As an aside: Regigigas is available in DPPt if you bring the 3 Regis, but they require you to transfer them from RSE. The Regis themselves are available in Platinum, but require you to bring a specific event Regigigas.
Additionally, Manaphy can be transferred from Pokémon Ranger and bred for Phione.

If you have access to Diamond, Pearl, and Platinum, but no Gen 3 games, your final total is (493 - Mew - Celebi - Jirachi - Deoxys - Phione - Manaphy - Shaymin - Darkrai - Arceus) = (484 - 9 Kanto starters - Mewtwo) = (474 - 9 Johto starters - 3 beasts - 2 birds) = (460 - 9 Hoenn starters - Regis - Latis - Weather Trio) = (443 - Caterpie line - Weedle line - Ekans line - Sandshrew line - Vulpix line - Growlithe line) = (429 - Pineco line - Shuckle - Teddiursa line) = (424 - Lotad line - Seedot line - Sableye - Mawile - Zangoose - Seviper - Lunatone - Solrock) = (412 - Regigigas) = 411.

I can and will finish this tomorrow but right now my brain's falling out

This is really good, thank you - extremely in-depth. I need to dig out my original notes for this and check against yours as you do hit on a couple of things I appear to have overlooked.

Generally speaking I should probably revise the original post a lot as there's a few corrections people have made I've not added in, but tbh I really don't have the motivation right now. Definitely a future project, though.

Zilche · Jan 1, 2023

I had another thing for gen 2. It'll be 2 less because you can only get one of the 3 hitmon evolutions. Sorry for the late notice but I think the final count for G/S is 197. Love your research btw, I'm using it as a reference! I'm on gen 3 now.

NaturalTropius · Jan 1, 2023

Zilche said:
I had another thing for gen 2. It'll be 2 less because you can only get one of the 3 hitmon evolutions. Sorry for the late notice but I think the final count for G/S is 197. Love your research btw, I'm using it as a reference! I'm on gen 3 now.

I think it's the same- can't you use a Ditto to breed for the other two?

Zilche · Jan 1, 2023

NaturalTropius said:
I think it's the same- can't you use a Ditto to breed for the other two?

AAAAAA yes. I didn't think about that. Thanks! Welp, time to go back to my beloved ditto.

QuentinQuonce · Mar 22, 2023

Updated this with an extremely late inclusion of Zilche and Altissimo's comments re GSC. I'd like to get back into this, so going to look into Emerald and do a recount - I assume the discrepancy between the 213 I ended up with and Altissimo's 212 is due to the second Lati being counted. This is an interesting topic so keen to delve more into it, as I'm certain I've missed things.

bwburke94 · Mar 24, 2023

Emerald's 212/213 discrepancy is either the second Lati or the second Moon Stone evolution.

Because the second Lati in non-Japanese copies of Emerald requires record mixing, it shouldn't be included in the count.

Altissimo · Mar 25, 2023

Since this got bumped again I'll point it out
I stopped doing the calcs after DPPt and said that Prof. Oak guides kind of cover the rest of the numbers, but nonetheless I'm beginning a process of curating a bunch of Pokedex data and sticking it on my website. Right now I've only got data for Gen 1 (though I'm working on Gen 2 now - it just takes a while since Pokedex pages arent the only thing on there). The data includes:

How many Pokemon can you get without trading? (aka. the goal of this thread and the Prof. Oak challenges)
- ... including a "sparknotes version" of the guides themselves...
- ... and a sparknotes guide for Japanese Blue, which doesn't have an official guide yet
How many Pokemon can you get without evolving? - inspired by my personal approach to playing Mystery Dungeon
Guides on how to complete the Pokedex if you can trade, with minimum equipment listed...
- ... including guides for whether you have access to Gen 1 as your trading games, Gen 2, or both...
- ... and including guides on the hoops you'd need to jump through to get a living dex.

I also intend to compile & upload pages on each Pokemon's lowest and highest possible (natural) levels, and the locations with the highest spawn rates for each Pokemon. I also might do some data on tradeback/transfer move exclusives (for all games, not just Gen 1/2) but some of that has been collated elsewhere and it might prove to get a little out of hand for me to handle alone. (Incidentally, though, this is one reason why I've come to support Dexit (as a person who's interested in the data itself), for curtailing how much of that we need to worry about.)

QuentinQuonce · Mar 25, 2023

Altissimo said:
Since this got bumped again I'll point it out
I stopped doing the calcs after DPPt and said that Prof. Oak guides kind of cover the rest of the numbers, but nonetheless I'm beginning a process of curating a bunch of Pokedex data and sticking it on my website. Right now I've only got data for Gen 1 (though I'm working on Gen 2 now - it just takes a while since Pokedex pages arent the only thing on there). The data includes:

How many Pokemon can you get without trading? (aka. the goal of this thread and the Prof. Oak challenges)

... including a "sparknotes version" of the guides themselves...

... and a sparknotes guide for Japanese Blue, which doesn't have an official guide yet

How many Pokemon can you get without evolving? - inspired by my personal approach to playing Mystery Dungeon

Guides on howto complete the Pokedex if you can trade, with minimum equipment listed...

... including guides for whether you have access to Gen 1 as your trading games, Gen 2, or both...

... and including guides on the hoops you'd need to jump through to get a living dex.

I also intend to compile & upload pages on each Pokemon's lowest and highest possible (natural) levels, and the locations with the highest spawn rates for each Pokemon. I also might do some data on tradeback/transfer move exclusives (for all games, not just Gen 1/2) but some of that has been collated elsewhere and it might prove to get a little out of hand for me to handle alone. (Incidentally, though, this is one reason why I've come to support Dexit (as a person who's interested in the data itself), for curtailing how much of that we need to worry about.)

Well, it's funny that you've said this because I've been thinking in the last few days that what might be useful (and an easier method of keeping track of counting) would be to make a spreadsheet for each game, noting what is obtainable and how, and noting oddities like the Moon Stone shortage in Sapphire/Emerald or the lack of evolution stones in general in GS.

I mainly use Excel for this sort of thing but if you like I'll see about doing it as a Google Doc and give you the ability to edit it as well - you can use it for your website. Might make things quicker, or at least be a good starting point for the data you want to cover.

Altissimo · Mar 25, 2023

I want to get as much info as possible into the site itself since I've been burned so many times by outdated links lol
But I'd be fine to help contribute!

Cobalt Empoleon · Mar 29, 2023

QuentinQuonce said:
The game compensates by making Milotic a trade-evolving Pokemon now, as well as adding four new Pokemon which only evolve by trade.

Minor question about this line: are you excluding Milotic from the Gen 5 count because it evolves by trade now? Because you can fish it up in rippling water on Route 1 (it's actually the first Pokemon I encountered with the Super Rod in White lol).

I might just be misinterpreting you though! Disregard if so

Research How many Pokemon are obtainable in each title?

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