If you ask me, if there's a "S-" Rank, Zangoose and Ralts could fit that criteria. As of now, one certainly has the argument that they're the best or/and most consistent of the A Ranks, with probably the only things holding them back being that Ralts only starts taking off early-mid game while Zangoose is unavailable until then too.
Merritt
Name: Oddish (Vileplume)
Availability: Route 110, 10%, Level 13
Stats: High Special Attack, middling Attack stat, and has good general bulk, but is slow. Sunny Day + Chlorophyll helps to patch up the speed issue though.
Typing: Gets access to strong mid to late game STABs and good resists, though its Poison typing can reveal some annoying weaknesses later in the game.
Movepool: Early game Oddish will be reliant on Bullet Seed and powder moves such as Poisonpowder, Stun Spore, and Sleep Powder for a substantial portion of the game. After acquiring Surf, more TMs such as Giga Drain, Sludge Bomb, Sunny Day, and Solarbeam become available. Not having any worthwhile non-STAB moves means Vileplume will struggle to beat Poison- and Steel-types.
Major Battles: Early-game Oddish will usually be harassing tough opponents with powder moves but generally won't be doing a lot of damage, meaning it has mediocre to outright bad matchups against nearly all the pre-Surf Gym Leaders. Vileplume is obtainable before fighting Winona as the Leaf Stone as well as the Sunny Day and Solarbeam TMs are in rather close proximity to each other around Fortree City, though Vileplume is only expected to beat Winona's Pelipper. Vileplume solos Sidney with ease, whereas SunnyBeam is especially useful in allowing Vileplume to heavily threaten Tate&Liza, Juan, Wallace, and to an extent Glacia, while providing solid damage against neutral targets such as Dusclops, Flygon, and Aggron. Vileplume's weaknesses against Psychic can be a nuisance when taking on Tate&Liza and Phoebe, and can only resort to powder moves against the likes of Drake's Altaria and Salamence, and Steven's Skarmory and Metagross.
Additional Comments: Oddish is also much more commonly available on Route 119 post-Surf, with the advantage of requiring less babying to reach the coveted Sunny Beam and Solarbeam TMs. One could even go after the high-leveled Glooms in Area 3 of the Safari Zone, where the SolarBeam TM is conveniently located.
Name: Oddish (Bellossom)
Availability: Route 110, 10%, Level 13
Stats: Good Special Attack and has great general bulk, but is slow. Sunny Day + Chlorophyll patches up the latter issue though.
Typing: Has some of the better Grass-type attacking options in the game, but that is all it really has in terms of attacking. It does have good resistances and the bulk to better shrug off non-STAB super effective attacks.
Movepool: Early game Oddish will be reliant on Bullet Seed and powder moves such as Poisonpowder, Stun Spore, and Sleep Powder for a substantial portion of the game. After acquiring Surf, the Sunny Day and Solarbeam TMs are mandatory for Bellossom, and having the option of being tutored Magical Leaf is a decent STAB alternative compared to the low PP Giga Drain. Unfortunately, Bellossom will be primarily reliant on powder moves to deal with anything that resists its lone STAB attacks.
Major Battles: Early-game Oddish will usually be harassing tough opponents with powder moves but generally won't be doing a lot of damage, meaning it has mediocre to outright bad matchups against nearly all the pre-Surf Gym Leaders. While the Sunny Day and Solarbeam TMs are pretty nearby to each other after Fortree City, the Sun Stone is only available at Mossdeep City. SunnyBeam allows Bellossom to heavily threaten Tate&Liza, Juan, Wallace, and to an extent Glacia, while providing solid damage against neutral targets such as Dusclops, Flygon, and Aggron. Bellossom can only respond with powder moves against any opponent that resists Grass.
Additional Comments: Oddish is also much more commonly available on Route 119 post-Surf, with the advantage of requiring less babying to reach the necessary Sunny Beam and Solarbeam TMs. One could even go after the high-leveled Glooms in Area 3 of the Safari Zone, where the SolarBeam TM is conveniently located.
Merritt

Name: Oddish (Vileplume)
Availability: Route 110, 10%, Level 13
Stats: High Special Attack, middling Attack stat, and has good general bulk, but is slow. Sunny Day + Chlorophyll helps to patch up the speed issue though.
Typing: Gets access to strong mid to late game STABs and good resists, though its Poison typing can reveal some annoying weaknesses later in the game.
Movepool: Early game Oddish will be reliant on Bullet Seed and powder moves such as Poisonpowder, Stun Spore, and Sleep Powder for a substantial portion of the game. After acquiring Surf, more TMs such as Giga Drain, Sludge Bomb, Sunny Day, and Solarbeam become available. Not having any worthwhile non-STAB moves means Vileplume will struggle to beat Poison- and Steel-types.
Major Battles: Early-game Oddish will usually be harassing tough opponents with powder moves but generally won't be doing a lot of damage, meaning it has mediocre to outright bad matchups against nearly all the pre-Surf Gym Leaders. Vileplume is obtainable before fighting Winona as the Leaf Stone as well as the Sunny Day and Solarbeam TMs are in rather close proximity to each other around Fortree City, though Vileplume is only expected to beat Winona's Pelipper. Vileplume solos Sidney with ease, whereas SunnyBeam is especially useful in allowing Vileplume to heavily threaten Tate&Liza, Juan, Wallace, and to an extent Glacia, while providing solid damage against neutral targets such as Dusclops, Flygon, and Aggron. Vileplume's weaknesses against Psychic can be a nuisance when taking on Tate&Liza and Phoebe, and can only resort to powder moves against the likes of Drake's Altaria and Salamence, and Steven's Skarmory and Metagross.
Additional Comments: Oddish is also much more commonly available on Route 119 post-Surf, with the advantage of requiring less babying to reach the coveted Sunny Beam and Solarbeam TMs. One could even go after the high-leveled Glooms in Area 3 of the Safari Zone, where the SolarBeam TM is conveniently located.

Name: Oddish (Bellossom)
Availability: Route 110, 10%, Level 13
Stats: Good Special Attack and has great general bulk, but is slow. Sunny Day + Chlorophyll patches up the latter issue though.
Typing: Has some of the better Grass-type attacking options in the game, but that is all it really has in terms of attacking. It does have good resistances and the bulk to better shrug off non-STAB super effective attacks.
Movepool: Early game Oddish will be reliant on Bullet Seed and powder moves such as Poisonpowder, Stun Spore, and Sleep Powder for a substantial portion of the game. After acquiring Surf, the Sunny Day and Solarbeam TMs are mandatory for Bellossom, and having the option of being tutored Magical Leaf is a decent STAB alternative compared to the low PP Giga Drain. Unfortunately, Bellossom will be primarily reliant on powder moves to deal with anything that resists its lone STAB attacks.
Major Battles: Early-game Oddish will usually be harassing tough opponents with powder moves but generally won't be doing a lot of damage, meaning it has mediocre to outright bad matchups against nearly all the pre-Surf Gym Leaders. While the Sunny Day and Solarbeam TMs are pretty nearby to each other after Fortree City, the Sun Stone is only available at Mossdeep City. SunnyBeam allows Bellossom to heavily threaten Tate&Liza, Juan, Wallace, and to an extent Glacia, while providing solid damage against neutral targets such as Dusclops, Flygon, and Aggron. Bellossom can only respond with powder moves against any opponent that resists Grass.
Additional Comments: Oddish is also much more commonly available on Route 119 post-Surf, with the advantage of requiring less babying to reach the necessary Sunny Beam and Solarbeam TMs. One could even go after the high-leveled Glooms in Area 3 of the Safari Zone, where the SolarBeam TM is conveniently located.
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