The exact level depends on which Pokemon it is.
Pokemon cannot learn Yawn in Pokemon Silver.
Bayleef Does Not Learn Sleep Powder in HeartGold/SoulSilver
It DOESN'T learn overheat. You can teach it but it doesn't learn it naturally.
if you have the machine click on it and if there is the word ABLE on it, it can learn it
fire Pokemon
no
Bellsprout.
No, it is not able to learn cut.
bellsprouts can learn it or pikachu (EDIT)** my togepi knows it
oddish. To the right of fortree
its in blackthorn city, the only Pokemon that can learn it is togekiss! Or some other Pokemon...
No, Chikorita is a grass type pokemon.