You have to migrate it from a gba game, such as Fire Red, or Leaf Green.
=D............................... Or just catch weepinbell or victreebell then catch a ditto and put both in day care and wait for egg! :)
It's the same as every other game; Bellsprout evolves into Weepinbell at level 21. And it evolves into Victrybell with a Leaf Stone.
In Pokemon Sapphire, Ruby, Emerald, FireRed, and LeafGreen, Bellsprout will learn Sweet Scent at level 30 if you do not evolve it. In Pokemon Diamond, Pearl, and Platinum, it'll learn Sweet Scent at level 29.
Bellsprout
Can't blue catches bellsprout.
Bellsprout evolves at level 21
Route 5,6,24,25,31,32,44 is where you find bellsprout
Bellsprout evolves into Weepinbel at level 21.
You can't catch Bellsprout in Sapphire. You have to trade it from LeafGreen.
Bellsprout is not available in firered it's only available in leafgreen.
You cannot have your playable character be a Bellsprout in Pokemon Mystery Dungeon Explorers of Sky. You can, after completing the main plot, recruit a Bellsprout and change it to party leader which effectively allows you to play as a Bellsprout, just only in missions.
Bellsprout evolves at level 21 and can evolve again by using a leaf stone.
You have to get a Bellsprout or Weepinbell. If you have a Bellsprout, evolve it. Then, once you have a Weepinbell, use a leaf stone on it.