depends....
if you chose chicoreta, then evolve it.
if you chose totodile then your rival should have it.
if you chose cindiquil then you have to trade for one.
Bayleef evolves into Meganium.
Bayleef Does Not Learn Sleep Powder in HeartGold/SoulSilver
Bayleef evolves at level 32. At level 32, bayleef will evolve into a meganium. Chikorita is one of the quick evolving Pokemon among the starters.
bayleef learns:Growl--100%1Razor Leaf5595%1Tackle3595%6Razor Leaf5595%9Poisonpowder--75%12Synthesis----18Reflect----22Magical Leaf60--26Natural Giftvaries100%32Sweet Scent--100%36Light Screen----40Body Slam85100%46Safeguard----50Aromatherapy----54Solarbeam120100%
Bayleef Evolves into Meganium at Lv. 32.
bayleef evolve into Meganium on level 32
Bayleef is a Grass type pokemon.
Bayleef evolves into Meganium at level 36.
If Bayleef is holding the EverStone it will not evolve, if it is holding the EverStone and you take it from Bayleef it will still Evolve.
bayleef evolves at level 32
Bayleef evolves into Meganium at Lvl 32
You need to evolve Chikorita or trade Bayleef from another game.