goldenrod
If you mean Soul silver, The easiest way is to buy it in the deparpment store
There Isn't
you dont make poffins in soul sliver
in the radio tower
no
jhoto and kanto regien Pokemon
you have to get it from Pokemon platinum or diamond
Happiny, into Chansey.
in the kanto region
in the cities
you cant
you dont use it it only unlocks a cave