Go east past the ruined island of Cinnabar and on one of the seafoam island his gym should be there.
I think if you get a rematch with Bugsy.
No, you don't battle Steven in HG/SS.
In the Battle Frontier. Or you can get it on another game, have a Pokemon hold it, and then send it to SS/HG using 2 DSs or the GTS.
yes. I've done it with both HG & SS.
You have to trade it from Diamond, Pearl, or Platinum. You can't evolve Eevee into it in HG/SS.
You can't battle Roark in HG/SS. If you saw that video on YouTube that giancarlomango11 made, it is all a hack.
Depends on whether or not you're in the Battle Frontier.
Pokemon black and white :D
no he does not evolve in Pokemon hg or ss
no
There are no PokeBlocks in HG/SS.
If you have non-Japanese battle revolution and Japanese hg/ss, then I think they are not programmed to work with each other-meaning you can't.