What Level Does Togepi Evolves At In Soul Silver?

It doesn't. You have to make it happy

Make sure it doesn't faint.
Give it vitamins (cal. Zinc ect)
keep it in the front of your party
go to goldenrod and give it haircuts (in goldenrod tunnel)
just pretty much treat it nicely

I believe you evolve through happiness or love. You have to give it a Soothe Bell, I think..