Bellsprout evolves in all Pokemon games on 21 or 22 level I'm not sure.
If you want Victribel you need Leaf stone.
Bellsprout evolves into a Weepinbell at level 21 in Pokemon Crystal.
Bellsprout evolves into Weepinbel at level 21.
Level 21
Bellsprout evolves at level 21.
21
It evolves at level 21.
It evolves into a Weepinbell at level 21.
Bellsprout evolves into Weepinbell at level 21.
You go and level it to Level 21, where it evolves to Weepinbell.
graveler doesnt evolve at a level, you evolve it by trading.
Bellsprout evolves at level 21
Level 18