Personally i would say as soon as you get gloom evolve it.
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Oddish evolves into Gloom at level 21.
gloom evolves into a vileplume with a leaf stone and into bellossom with a sun stone
Oddish evolves into Gloom at level 21.
he evolves into gloom starting at level 21
Gloom doesn't evolve into Bellossom by leveling up. Use a Leaf Stone and TADA! A Bellossom! : )