Do you mean what Pokemon can learn Flash? Bellsprout can, and I think Togepi can, too.
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Any Pokemon that can learn a electric move
I don't know all of the Pokemon that can learn Headbutt, but I know that Cubone can learn it.
Electivire cannot learn Volt Tackle in Pokemon HeartGold. Only pichu, pikachu, and raichu can learn volt tackle.
No Gastly cannot learn fly in Pokémon HeartGold.
Bayleef Does Not Learn Sleep Powder in HeartGold/SoulSilver