Go to Professor Oak's lab in Pallet Town, and you may choose from Squirtle, Bulbasaur and Charmander as a starter Pokemon in Kanto
There Isn't
you dont make poffins in soul sliver
in the radio tower
no
goldenrod
jhoto and kanto regien Pokemon
you have to get it from Pokemon platinum or diamond
Happiny, into Chansey.
you cant
in the kanto region
in the cities
you dont use it it only unlocks a cave