He can't evolve by himself. You have to use a fire stone on Growlithe, which can happen at any level.
Growlithe never evolves. You must use a fire stone.
Level 36.
Growlithe will evolve if you use a fire stone on it.
Bellsprout evolves into a Weepinbell at level 21 in Pokemon Crystal.
Caterpie evolves into Metapod at level 7, and then into Butterfree at level 10
It evolves at Lvl. 25
In pokemon crystal Pigeotto evolve in 36lvl
Mareep will evolve at Level 15 in Pokémon Crystal.
Slowpoke will evolve at Level 37.
The Level When You Get A Life.
level 30
Level 30.
41
30
Level 36.
You need to level Zubat up to level 22. Then it will evolve into Golbat.
Growlithe will evolve if you use a fire stone on it.
30 or 40