once your togepi evolves into togetic let him or her level up five times and then use a sun stone on it.
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It's impossible you need to migrate it to Diamond or Pearl and give it a Shiny stone to make it evolve into a Togekiss.
No
Buneary, Mamoswine, Pachirisu, cyndaquil, togekiss ( I have no clue when she will get Togekiss), and Piplup.
Togekiss is a Generation 4 Pokemon, so it's impossible. (That and the Shiny Stone doesn't exist before that Generation.)
togetic and togekiss