Bellossom

Bellossom’s pure Grass-typing is its advantage against Water-type raids like Vaporeon and Croconaw. Unfortunately, its underwhelming stats don’t allow it to keep up with raids higher than level two. Other Grass-types, including Bellosom’s alternate evolution, Vileplume, are better in the role of Grass-type attacker.

Best PvE Offensive Moveset

• Razor Leaf is superior to Bullet Seed.

• Acid lacks STAB. 

• Leaf Blade is superior to Petal Blizzard for the shorter charge time. 

• Dazzling Gleam lacks STAB and synergy with Bellossom's fast moves. Use your TM here.

Best PvE Defensive Moveset

• Acid does neutral damage to Bellossom’s worst matchups, and has slightly better energy gain than Razor Leaf.

• Bullet Seed doesn't deal a lot of damage on defense. 

• Leaf Blade is superior to its other charge moves due to the low energy cost and difficult reaction timing.

• Dazzling Gleam has decent coverage against Bellossom’s counters and packs a punch with 2 bars, but it is more easily dodged.

• Petal Blizzard is too slow to charge to get use.

Razor Leaf features incredible damage output with STAB, at the cost of having the worst energy generation in the game. Bullet Seed is the exact opposite, trading away damage output for significantly better energy gains. Either option can be viable. 

Leaf Blade is one of the best charge moves in the game due to its low energy cost and high damage value, and also gets STAB. Dazzling Gleam and Return both cost a lot of energy, though they offer different typing coverage. Petal Blizzard is inferior to Leaf Blade.