You use a fire stone at any level you want.
fire stone
fire stone
Growlithe can Evolve only with use of a fire stone. Fire stones can be won at the bug catching contests.
firestone You can't evolve it by leveling up it only evolves by firestone usage like pansear and eeve ect.
There is no specific place for a growithe to evolve. you just need to give it a fire stone
Golduck does not evolve
You have to have it have high happiness. It doesn't evolve at a level.
Wooper will evolve at Level 20.
Unowns do not evolve.
Level 30
Snorlax does not evolve. In gold, it is a non-evolutionary pokemon.
Farfetch'd is a Pokemon that does not evolve.