Alright, I have finally managed to beat the Elite Four in Crystal (sorry for the delay, University life caught up with me). I will now state my opinions on the Pokemon I have used.
Cyndaquil: A rank
Has good match-ups against most early-game trainers (notably Sprout Tower and the Azalea Gym) while having enough power to win against neutral match-ups such as Violet Gym and the Rockets. The only unimpressive phase it has is mid-game where having Ember as your only STAB move until Lv 31, by which point you would have defeated Pryce (this also means it has a bad match-up against Jasmine since Ember can't OHKO Steelix) . It also can't contribute much against Clair. However, it manages to defeat Will (if taught Thunder Punch) and Koga single-handedly while also providing an answer to Lance's Gyarados and Charizard.
Slowpoke: C rank
Perhaps I'm missing something but a freshly caught Slowpoke from Azalea would be very underlevelled and would not be able to contribute against the Rival and Azalea Gym. It also really wants the Headbutt TM as having Tackle as your only attack until LV15 really sucks. While you will have Confusion and early Surf by Ecruteak, Slowpoke's low Speed means it is going to take damage before using Confusion / Surf against the Ghosts. These attacks also rarely OHKO since it is coming from such a low base SpA stat. Due to this, it can't hope to take on the Blackthorn Gym even if you use the Icy Wind TM as you lose to the Dragonaires (who 2HKO you while you can't OHKO back and is outsped due to your low Speed stat even after Icy Wind's Speed drop). However, it is able to easily defeat Bruno and is bulky enough to beat some of Lance's Pokemon (it can beat most mons 1 on 1 except Gyarados but it can't hope to sweep due to its low Speed.)
Golbat : A rank
One of the most consistent performers of the team. Grab one of them from after Morty with a Friend Ball and give it the Return TM. Also, by using the Haircut brothers, it will increase in happiness soon enough. It may be underlevelled at first but it can level up quickly by fighting against the Mahogany Rockets and Wild Pokemon of the Bug Catching Contest. You should have a Crobat around LV 15 to 18. While you won't have STAB in time for Chuck, Return allows Crobat to wreck everything in the Gym and you gain STAB Fly soon afterwards. Crobat is also able to take on Pryce's Seel and Dewgong 1 on 1 due to the sheer power of its attacks (not both though since you can't OHKO and Aurora Beam 2HKOes ). Crobat is also able to sweep Koga, defeat Karen's Gengar and provide an answer to Bruno's Fighting types. If the situation requires it, it can finish off weakened Dragonite or Charizard due to its high Speed.
Sandshrew : C rank
Sandshrew suffers from the same problems as Slowpoke, it has low Speed and attack stats. It is also completely TM dependent since its natural movepool sucks). It will almost certainly be underlevelled for Azalea Gym although it can take on Whitney's Miltank using the Defense Curl + Rollout combo (the Rollout TM is obtained near the National Park. You also gain the Dig TM around this time). While STAB Dig can OHKO the Gastly's in Ecruteak Gym, you can't sweep due to your low Speed and you also can't OHKO Haunter with your low Attack stat while it 2HKO back. However, Sandshrew can completely destroy Rockets and Tentacools to level up quickly. Sandslash can take on Chuck's Primeape and sweep Jasmine although it can't contribute against Pryce. It can take on Claire's Dragonaires but loses completely to Kingdra. Against the Elite 4, Sandslash wipes the floor with Koga and Karen with its Ground + Rock coverage. It can also be an answer to Lance's Aerodactyl and Charizard.
Ledyba : E rank
This thing is complete garbage. It has an awful movepool and even more awful stats that you need to give it TM support to make sure it suck less. If you don't have the Headbutt TM (thank God it is sold for 2000 dollars instead of being unique, this TM is a lifesaver to many Pokemon), have fun training this thing to Level 18 where it evolves to Ledian. While Ledian has great Special Defense and has access to Ice Punch and Thunder Punch, it's awful attacking stats mean it is not going to KO opponents even if they're Super Effective moves. The only Gyms where it can contribute is Chuck (if taught Thunder Punch) and Claire (if taught Ice Punch). Note that Ledian can only 2-3HKO Dragonaire with Ice Punch and is 3HKO-ed in return. Furthermore, it is complete deadweight in all other Gym Battles. You can use it as an answer to Gyarados with Thunder Punch (very shaky since Thunder Punch 2HKOes while Hyper Beam has a high chance to OHKO) or Dragonite (you 2-3HKO while got 2HKOed in return). In short, Ledian is a mon that requires a lot of support and provides very little, if at all in return.
Bellsprout : D rank
GSC is very harsh on Grass types and Bellsprout is no exception. It as an awful natural movepool and bad match-ups against most Gyms. Having Vine Whip as your only STAB move (don't even mention Acid) until the Sludge Bomb TM really sucks. Also, in order to learn Razor Leaf, you need to have it unevolved until LV 37 or raise a Weepingbel until LV 42, by which point you are in Victory Road or are challenging the Elite Four already. Furthermore, since it is a Stone Evolution, you need luck so that Gina will call you and give you a Leaf Stone (yes, you can mess with Daylight Saving Time but you still rely heavily on luck for her to call you and give you the stone). It's only good Gym performances come against Chuck and Pryce (shaky since you won't have Razor Leaf and Vine Whip only 2HKOes). Heck, you even lose to Dragonaires and Kingdra unless you get lucky with Sleep Powder and teach it Sludge Bomb. (Even then, Kingdra OHKOes with Hyper Beam). It also has a poor match-up against the Elite 4 except against Will's Slowbro and Bruno.
To answer Colonel M's question, the Togepi Egg hatches around Goldenrod while the Odd Egg hatches around Olivine. I previously used an Elekid from the Odd Egg too.
Elekid : C rank
Hatching in Olivine City at LV 5 means it requires babying for quite some time. Elekid has a good movepool for a GSC Pokemon as it can have Ice Punch by TM and Thunder Punch at LV9. Although you can beat up Swimmers and Tentacools on the way, Elekid will find itself underlevelled against Chuck and Jasmine while also losing to Pryce (low stats as Elekid means its losing to Dewgong and Piloswine). As an Electabuzz, it is also able to naturally learn Thunderbolt (LV 41) around Victory Road and Fire Punch from TM. It completely sweeps Claire (with Ice Punch), Will (Thunderbolt), Koga (Fire Punch) and Lance (Ice Punch). While these feats are impressive, Odd Egg's randomness and Elekid's unimpressive phase downgrades it to C rank.
Jynx : B rank
A lategame addition to the team, Jynx performs very well against the Blackthorn Gym since it comes with Lovely Kiss and gains Ice Punch soon after capture. It also performs well against Will (Shadow Ball) and Lance's Dragonites. If it is the Odd Egg Smoochum, it doesn't have Lovely Kiss but has STAB Confusion and can gain Psychic at LV 37 (although this will be very late in the game, it gives Jynx a stronger STAB move and allows it to destroy Koga and Bruno)
Cyndaquil: A rank
Has good match-ups against most early-game trainers (notably Sprout Tower and the Azalea Gym) while having enough power to win against neutral match-ups such as Violet Gym and the Rockets. The only unimpressive phase it has is mid-game where having Ember as your only STAB move until Lv 31, by which point you would have defeated Pryce (this also means it has a bad match-up against Jasmine since Ember can't OHKO Steelix) . It also can't contribute much against Clair. However, it manages to defeat Will (if taught Thunder Punch) and Koga single-handedly while also providing an answer to Lance's Gyarados and Charizard.
Slowpoke: C rank
Perhaps I'm missing something but a freshly caught Slowpoke from Azalea would be very underlevelled and would not be able to contribute against the Rival and Azalea Gym. It also really wants the Headbutt TM as having Tackle as your only attack until LV15 really sucks. While you will have Confusion and early Surf by Ecruteak, Slowpoke's low Speed means it is going to take damage before using Confusion / Surf against the Ghosts. These attacks also rarely OHKO since it is coming from such a low base SpA stat. Due to this, it can't hope to take on the Blackthorn Gym even if you use the Icy Wind TM as you lose to the Dragonaires (who 2HKO you while you can't OHKO back and is outsped due to your low Speed stat even after Icy Wind's Speed drop). However, it is able to easily defeat Bruno and is bulky enough to beat some of Lance's Pokemon (it can beat most mons 1 on 1 except Gyarados but it can't hope to sweep due to its low Speed.)
Golbat : A rank
One of the most consistent performers of the team. Grab one of them from after Morty with a Friend Ball and give it the Return TM. Also, by using the Haircut brothers, it will increase in happiness soon enough. It may be underlevelled at first but it can level up quickly by fighting against the Mahogany Rockets and Wild Pokemon of the Bug Catching Contest. You should have a Crobat around LV 15 to 18. While you won't have STAB in time for Chuck, Return allows Crobat to wreck everything in the Gym and you gain STAB Fly soon afterwards. Crobat is also able to take on Pryce's Seel and Dewgong 1 on 1 due to the sheer power of its attacks (not both though since you can't OHKO and Aurora Beam 2HKOes ). Crobat is also able to sweep Koga, defeat Karen's Gengar and provide an answer to Bruno's Fighting types. If the situation requires it, it can finish off weakened Dragonite or Charizard due to its high Speed.
Sandshrew : C rank
Sandshrew suffers from the same problems as Slowpoke, it has low Speed and attack stats. It is also completely TM dependent since its natural movepool sucks). It will almost certainly be underlevelled for Azalea Gym although it can take on Whitney's Miltank using the Defense Curl + Rollout combo (the Rollout TM is obtained near the National Park. You also gain the Dig TM around this time). While STAB Dig can OHKO the Gastly's in Ecruteak Gym, you can't sweep due to your low Speed and you also can't OHKO Haunter with your low Attack stat while it 2HKO back. However, Sandshrew can completely destroy Rockets and Tentacools to level up quickly. Sandslash can take on Chuck's Primeape and sweep Jasmine although it can't contribute against Pryce. It can take on Claire's Dragonaires but loses completely to Kingdra. Against the Elite 4, Sandslash wipes the floor with Koga and Karen with its Ground + Rock coverage. It can also be an answer to Lance's Aerodactyl and Charizard.
Ledyba : E rank
This thing is complete garbage. It has an awful movepool and even more awful stats that you need to give it TM support to make sure it suck less. If you don't have the Headbutt TM (thank God it is sold for 2000 dollars instead of being unique, this TM is a lifesaver to many Pokemon), have fun training this thing to Level 18 where it evolves to Ledian. While Ledian has great Special Defense and has access to Ice Punch and Thunder Punch, it's awful attacking stats mean it is not going to KO opponents even if they're Super Effective moves. The only Gyms where it can contribute is Chuck (if taught Thunder Punch) and Claire (if taught Ice Punch). Note that Ledian can only 2-3HKO Dragonaire with Ice Punch and is 3HKO-ed in return. Furthermore, it is complete deadweight in all other Gym Battles. You can use it as an answer to Gyarados with Thunder Punch (very shaky since Thunder Punch 2HKOes while Hyper Beam has a high chance to OHKO) or Dragonite (you 2-3HKO while got 2HKOed in return). In short, Ledian is a mon that requires a lot of support and provides very little, if at all in return.
Bellsprout : D rank
GSC is very harsh on Grass types and Bellsprout is no exception. It as an awful natural movepool and bad match-ups against most Gyms. Having Vine Whip as your only STAB move (don't even mention Acid) until the Sludge Bomb TM really sucks. Also, in order to learn Razor Leaf, you need to have it unevolved until LV 37 or raise a Weepingbel until LV 42, by which point you are in Victory Road or are challenging the Elite Four already. Furthermore, since it is a Stone Evolution, you need luck so that Gina will call you and give you a Leaf Stone (yes, you can mess with Daylight Saving Time but you still rely heavily on luck for her to call you and give you the stone). It's only good Gym performances come against Chuck and Pryce (shaky since you won't have Razor Leaf and Vine Whip only 2HKOes). Heck, you even lose to Dragonaires and Kingdra unless you get lucky with Sleep Powder and teach it Sludge Bomb. (Even then, Kingdra OHKOes with Hyper Beam). It also has a poor match-up against the Elite 4 except against Will's Slowbro and Bruno.
To answer Colonel M's question, the Togepi Egg hatches around Goldenrod while the Odd Egg hatches around Olivine. I previously used an Elekid from the Odd Egg too.
Elekid : C rank
Hatching in Olivine City at LV 5 means it requires babying for quite some time. Elekid has a good movepool for a GSC Pokemon as it can have Ice Punch by TM and Thunder Punch at LV9. Although you can beat up Swimmers and Tentacools on the way, Elekid will find itself underlevelled against Chuck and Jasmine while also losing to Pryce (low stats as Elekid means its losing to Dewgong and Piloswine). As an Electabuzz, it is also able to naturally learn Thunderbolt (LV 41) around Victory Road and Fire Punch from TM. It completely sweeps Claire (with Ice Punch), Will (Thunderbolt), Koga (Fire Punch) and Lance (Ice Punch). While these feats are impressive, Odd Egg's randomness and Elekid's unimpressive phase downgrades it to C rank.
Jynx : B rank
A lategame addition to the team, Jynx performs very well against the Blackthorn Gym since it comes with Lovely Kiss and gains Ice Punch soon after capture. It also performs well against Will (Shadow Ball) and Lance's Dragonites. If it is the Odd Egg Smoochum, it doesn't have Lovely Kiss but has STAB Confusion and can gain Psychic at LV 37 (although this will be very late in the game, it gives Jynx a stronger STAB move and allows it to destroy Koga and Bruno)
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