Steven is in Silph Co. in Saffron city
No, there is not. Sorry...
No, you don't battle Steven in HG/SS.
After defeating all 16 gym leaders, Steven Stone, the Champion of the Hoenn League, will give you one of the Hoenn starters depending on which stone you picked.or by hacking if you need it before you do all that stuff
A: chikorita totodile and cyndaquil
He does not appear anywhere else
Trade with other people who have heart gold or soul silver.
Yes there will be it is called Pokemon heart Gold and soul Silver it come out 3/14/10 the starters are the same as original Pokemon Gold and Silver
no only johto and kanto but you can get the 3 hoenn starters
you migrate them from fire red or leaf green or trade them from soul silver or heart gold
You can choose it between charmander Bulbasaur and Squirtle from Steven later in the game
You can do many things, you can get the hoenn starters by talking to steven stone in silph co you can catch groudon by talking to mr Pokemon then going to the embedded tower( on the route to the safari zone) trde kyogre with a friend with Pokemon heart gold and talk to oak to get a rayquaza
You can first collect all of the Pokemon for the hoen dex in Pokemon emerald you will get 1 of the 3 Pokemon gold/silver/crystle series starters then use the get all of the starters trick to get them all then migrate them to Pokemon diamond or pearl.