Well Evee evolves into 3 things in fire red if you have stones you can give it an electric stone, water stone, fire stone
Growlithe can evolve with a fire stone
There are more but that is all i can think of so far
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yes, cheats or using stones in the game. Some Pokemon can't evolve without stones or special ways to evolve, so check about whether or not the Pokemon youre trying to evolve needs a special evolution. Bug Pokemon evolve fast.
Exeggcute evolves into Exeggutor using a leaf stone.
An everstone is used to prevent evolution
Evolve the Eevee you get given at the top (using the back entrance) of the Pokemon 'Mansion' in Celadon using a Thunderstone.
Clefairy cannot evolve into Clefable by leveling up in Pokemon FireRed. The only way to evolve Clefairy is by using a Moon Stone on it.