Bulbasaur in FireRed.
Bulbasaur is a starter in Pokemon FireRed: Professor Oak offers it at level 5 at the start, and it appears nowhere in the wild.
Evolution
3 stages
Bulbasaur
Ivysaur
VenusaurEvolves into Ivysaur at level 16.
Evolve now or wait
from the game's learnsets and the relearner ruleBulbasaur evolves at level 16. Nothing is lost by evolving straight away: every move Bulbasaur learns after that, Ivysaur learns too.
Rule the game applies: the Move Relearner on Two Island (he takes two Tiny Mushrooms or one Big Mushroom) teaches only the level-up moves of the form you hand him, at or below its current level. Delaying an evolution costs the evolved form's higher base stats for every level you wait; a move you barely use is not worth that.
Bulbasaur learnset in FireRed
11 level-up moves · 19 machinesBy level
Ivysaur by level
TMs and HMs it can learn (19)
HM01 Cut, HM04 Strength, HM05 Flash, HM06 Rock Smash, TM06 Toxic, TM09 Bullet Seed, TM10 Hidden Power, TM11 Sunny Day, TM17 Protect, TM19 Giga Drain, TM21 Frustration, TM22 Solar Beam, TM27 Return, TM32 Double Team, TM36 Sludge Bomb, TM42 Facade, TM43 Secret Power, TM44 Rest, TM45 Attract