It should already know Growl and Charm, but it learns Metronome at level 5.
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No, Togepi cannot learn Surf.
Togepi does not evolve at a certain level. If Togepi's happiness/friendship towards the player is at, or close to maximum, and it levels up, it will evolve into a Togetic.
Yes Togepi does evolve in Pokémon SoulSilver. It does evolve, but instead of evolving by levels, it evolves by happiness, which happens in every other Pokemon game with Togepi
bellsprouts can learn it or pikachu (EDIT)** my togepi knows it
Do you mean what Pokemon can learn Flash? Bellsprout can, and I think Togepi can, too.