[Hemp Man]

Psyduck - Mid Tier
-Availability: Psyduck can be caught at Seafoam Islands or using Super Rods at certain Routes. Both Seaform Islands and Super Rod are only accessible around Koga, so mid-late game. In Yellow, he is found by Surfing Route 6.
-Stats: Golduck's stats can be described as "Jack of all Trades, Master of None." All his stats are good, but none of them particularly stand out.
-Movepool: Golduck's movepool is pretty much the same as most water types. It can get by on STAB Surf, Ice Beam/Blizzard TM, and Strength for Physical Coverage. Golduck also learns Confusion via levelup, but Confusion has a low base power means that even a STAB Surf will do more damage than a Super Effective Confusion most of the time.
-Power: As a Psyduck, it doesn't hit hard at all. However, the ones at Seaform Island can be caught at level high enough that it will evolve into Golduck fast. Golduck is good at taking foes out.
-Type: Water. Water is a great type to get in the late-game, as it hits the final two gyms for Super Effective. Water is weak to Grass and Electric, but those moves are not common in the later parts of Red and Blue.
-Match-ups:
--Sabrina: Her Pokemon have powerful Special stats that wear fast. Golduck can stay in against Venomoth, but don't expect a sweep here.
--Blaine: Golduck resists Fire, and his STAB Surf hits Blaine's entire team for Super Effective damage.
--Giovanni: Giovanni's whole team is weak to Water, so Surf will take them out easily. In Yellow, this match will be tougher due to his Persian not being weak to Water, and his Nidoqueen/Nidoking having Thunder.
--Lorelei: With the exception of Jynx her whole team resists Water and is good at taking Physical Attacks/Ice moves. So don't use Golduck unless its a last resort.
--Bruno: Surf OHKO's both Onix, and easily deposes of his Fighting Pokemon due to their weak Special.
--Agatha: Golbat and Arbok are manageable, but her Ghosts have high Specials and can wear you down easily.
--Lance: Aerodactyl is weak to Water and the Dragons go down to Ice Moves. Gyarados can take Golduck's attacks and packs a powerful Hyper Beam, so have a teammate eliminate Gyarados before attempting a Golduck sweep. Keep in mind in Yellow version, one of his Dragonair's and his Dragonite have Thunderbolt and Thunder
--Rival: Golduck can beat Pidgeot, Rhydon, Exeggutor (with an Ice attack), and his Fire Pokemon (either Charizard or Arcanine). However Alakazam, Venusaur, and his Water types can be problematic for Golduck.
In Yellow, Golduck can beat Exeggutor, Sandslash, Ninetails, Vaporeon and Flareon. It loses to Jolteon, Magenton, Alakazam, and Cloyster.
-Additional Comments: As you can see, Golduck seems like a generic in-game Water type. What makes Golduck excel so well it comes at the right time and at the right moment. It comes at a time where Water becomes a highly relevant type, with the Fire and Ground bosses being at the late game. Overall, Golduck doesn't really anything that makes it stand out compared to other Water Pokemon, but it fulfills the niches of a Water Pokemon well.

And I rewrote my Venusaur write-up too:
Bulbasaur (RB) - Top Tier
-Availability: Starter Pokemon
-Stats: Above Average, his high Special works well with Razor Leaf’s critical hit ratio.
-Movepool: Bulbasaur mostly gets Grass and Normal moves to work with, which isn’t too bad as only Gengar resists both of them. Razor Leaf is probably the best Grass move for him to work with, where as Body Slam/Double-Edge TM’s give him normal coverage.
Venusaur can also try a Growth + Mega Drain, but probably isn’t the suitable Grass type for this set due to learning Sleep Powder at such a late level.
-Power: Venusaur’s high Special and Razor Leaf’s CH ratio will hit anything that doesn’t resist it hard.
-Type: Grass/Poison. While Grass gives him the advantage over early gym leader, its STAB is resisted by many types. Most notable the abundance of Poison types in this game resist Razor Leaf, putting a damper on its power.
-Match-ups:
--Brock: Vine Whip is 4x Super Effective on his Pokemon and should take them out easily.
--Misty: Grass resists Water, and Ivysaur’s Vince Whip can take out Staryu and Starmie.
--LT Surge: Ivysaur resists Electric, meaning he can take a hit here. Surge’s Pikachu and Raichu both know Thunder Wave, so outside of Paralyze Hax, you should be fine.
--Erika: Erika's Pokemon resist Grass, so it will need a strong normal move such as Body Slam or Double-Edge if it wants to hold its own. Even if you have a strong normal move, Victreebel still might be a tough fight due to Sleep Powder + Wrap. Tangela can take a hit, but he can’t do much back to Venusaur. Vileplume is completely walled by Venusaur.
--Koga: Posion resists Grass, and his Pokemon have good Defense to take a Normal move. However, his Pokemon don’t really have the best movesets and Razor Leaf spam can wear down his team.
--Sabrina: Venusaur is weak to Psychic meaning he wont be able to accomplish much here. Also, Venusaur is actually weak to Bug in RBY, so even Venomoth threatens Venusaur.
--Blaine: A strong normal move can take out Ponyta and Growlithe, but Rapidash outspeeds you and can Fire Spin trap you. Blaine’s Arcanine knows Fire Blast, which Venusaur wont enjoy taking at all.
--Giovanni: Razor Leaf will easily dispose of Rhyhorn, Rhydon, and Dugtrio. Nidoqueen and Nidoking are not weak to Razor Leaf, but Venusaur can still take them out 1-1.
--Lorlelei: Venusaur is weak to Ice, but if you are at an appropriate level, Razor Leaf will make short work of Dewgong, Cloyster, and Slowbro. Jynx however isn’t weak to Grass, and Lapras has the bulk to take a Razor Leaf and retaliate with Blizzard.
--Bruno: Razor Leaf sweeps his whole team due to Brunos’ Pokemon having low Special.
--Agatha: Her entire team resists Grass, and the Ghosts even resist your Normal Moves.
--Lance: Due to the AI always going for Super Effective hits, his Dragonairs and Dragonites will only use Agility/Barrier and Venusaur can take them. Gyarados has a powerful Hyper Beam, but Venusaur resists his Hydro Pump and can wear him down with Razor Leaf. Aerodatyl is also another powerful user of Hyper Beam, but his low Special means Razor Leaf will make short work of him.
--Gary: On a positive note, Rhydon is OHKO’d by a Grass move. Gary’s Exeggutor doesn’t know Psychic so Venusaur can beat him with a strong normal move. Venusaur resists Gyarados’s Hydro Pump, just watch out for Hyper Beam. However, Pidgeot resists Grass and Sky Attack will either make you switch out or be fainted. Alakazam outspeeds Venusaur and destroys it with Psychic. Charizard can also take you out with Fire Blast.
-Additional Comments: Much like Charmander and Squirtle, Bulbasaur is a great in-game starter Pokemon. It excels in the beginning due to its type advantage over Gyms. Although Grass as a type starts to lose value as the game goes on, at that point you’ll have team mates to make sure you are not fully dependent on your starter. Towards the end of the game Grass makes a comeback due to the Ground gym and the abundance of Water types around. Overall, you can’t really go wrong with any starter in Red & Blue, and Bulbasaur is no exception to this.