In the Champion Elder's room. You need to have battled the Elite four in Unova at least once and to have beaten Cynthia. Cynthia is in Undella town.
You can't battle Steven in Pokemon HeartGold.
You can't battle Steven in Pokemon HeartGold.
You can't battle Steven in Pokemon SoulSilver or HeartGold.
No, you don't battle Steven in HG/SS.
Steven isn't battleable in the game.
No you can't
you dont.
No, you only battle Steven because in Pokemon emerald Wallace is the champion.
Unfortunately, you cannot battle Steven on Pokemon HeartGold or SoulSilver unless an event comes in the future.
you can not battle the kanto champion in pokemon white but you can in the sequel
No you cant because Pokemon White and Black has new Pokemon that Pokemon battle Revolution cant use
steven doesnt get any stronger when u double battle with him