When you finally manage to fight him, his Pokemon will be levels 75 to level 77.
But after beating the elite for twice to get to him you should be fine.
*on Sapphire and ruby it is Steven on fire red and leafy green it is the rival you name in the beginning ^don't forget Lance is the Champion of the Johto Region and Cynthia the Sinnoh Region Champion and the Unova Region Champion is Adeku(Pokemon Black and White) although you fight Geechisu in the first try. *little bonus Wallace is the Champion on Pokemon Emerald, You can fight Steven though in meteor falls were you get the iron tail TM.
no
fight night champion!
You can fight Cynthia in black or white after you beat the elite four and ask for him/her at GTS.
You cannot fight the Gym Leaders again in Pokémon Black after defeating them and being awarded their Gym Badges.
*on Sapphire and ruby it is Steven on fire red and leafy green it is the rival you name in the beginning ^don't forget Lance is the Champion of the Johto Region and Cynthia the Sinnoh Region Champion and the Unova Region Champion is Adeku(Pokemon Black and White) although you fight Geechisu in the first try. *little bonus Wallace is the Champion on Pokemon Emerald, You can fight Steven though in meteor falls were you get the iron tail TM.
there is shikimi (ghost types), giima (dark types), Caitlin (psychic types) and renbu (fighting types). the first time you beat them you have to fight n and geechisu instead of the champion. the second time onwards the champion is adeku (no specialty but he does have 3 bug types)
no
Yes you can battle the elite four and the champion as many times as you want
you fight your rival
You either fight N or fight the champion
At the end of the elite 4 he is the champion.
You can only get reshirem in Pokemon black not white. Its after you beat the Pokemon league for the first time. When you get to the champion team plasma boss will be there with the champion. Then you just follow the story line until you see the leader summon reshirem and your dark orb glows and transforms into zekrom. Then you catch it then fight him
Fight the Elite Four again. Everytime you win the champion, the 3 musketeers would be available for catching again.
Sorry, you can't in Pokemon Heartgold. But you can in Emerald, Ruby, Saphire and crystal.
technically, when you beat the Pokemon league, you become the champion. but you cannot really fight as a part of the Pokemon league
It might depend on the Pokemon, though usually you can face legendary Pokemon again if you beat the Champion.