You cant its only in Enterna City in Diamond and Pearl
You buy protein at the department store on the 4th floor. (in goldenrod city.)
you must buy it in goldenrod city
You buy it at the game corner in Goldenrod City.
buy it from blackthorn city or the safari zone gate i belive
buy it
at the pokeathalon
well now you can buy it at gamestop for about $40
1. its SOUL SILVER and 2. yes you can you can buy it at a department store.
In soul silver in find it in the cave into city where Misty is the gym leader the city starts with a c buy I forgot the name p.s. Mew2 is level 70
In the USA, it is $40.00.
In the pokemarts. I think goldenrod
u buy it