Bellsprout evolves at level 21 and can evolve again by using a leaf stone.
Bellsprout evolves at level 21
it doesnt evlove by level. you need to trade it and it will evlove for them, then they trade it back.
Level 36.
Level 25.
Level 28.
Bellsprout evolves into Weepinbel at level 21.
Level 18
Level 20.
55
level 33
level 40
Bellsprout evolves into a Weepinbell at level 21 in Pokemon Crystal.