What stone do you need to evolve Togepi?

many Pokemon need stones to evolve. some are pichu, pikachu, and raichu. to evolve a pichu or a pikachu, they will need some sort of electric stone. to evolve a gloom (evolved form of oddish), you will need a stone. if you give a gloom a leaf stone, it will evolve into a vileplume. if you give a gloom a sun stone, it will evolve into bellosom. the list goes on, but I'm tired of typing.