You actually fight the Elite 4 twice. But the first time, you don't fight the champion, instead you fight Reshiram/Zekrom, N and Ghetsis.
Shauntal (Ghost types) First Time
Cofagrigus level 48
Golurk level 48
Jellicent level 48
Chandelure level 48
Second Time
Cofagrigus level 71
Golurk level 71
Jellicent level 71
Froslass level 71
Drifblim level 71
Chandelure level 73
Grimsley (Dark Types) First Time
Scrafty level 48
Liepard level 48
Krookodile level 48
Bisharp level 50
Second Time
Sharpedo level 71
Drapion level 71
Scrafty level 71
Krookodile level 71
Liapard level 71
Bisharp level 73
Marshal (fighting types) First Time
Throh level 48
Sawk level 48
Conkeldurr level 48
Mienshao level 50
Second Time
Breloom level 71
Throh level 71
Sawk level 71
Toxicroak level 71
Konkeldurr level 71
Mienshao level 73
Caitlin (Psychic types) First Time
Reuniclus level 48
Sigilyph level 48
Musharna level 48
Gothitelle level 50
Second Time
Reuniclus level 71
Sigilyph level 71
Musharna level 71
Bronzong level 71
Gothitelle level 71
Metagross level 71
N
Zekron/Reshiram ( depends what version you have) level 52
Carracoasta level 50
Archeops level 50
Vaniluxxe level 50
Kilnklang level 50
Zoroark level 50
Ghetsis
Cofagrgus level 52
Bouffelant level 52
Bisharp level 52
Seismetoad level 52
Elektross level 52
Hydreigon level 54
Alder (Second time only)
Druddigon level 75
Bouffelant level 75
Accelgor level 75
Escavelier level 75
Vaniluxxe level 75
Volcarona level 77
heartgold and soulsilver before and after elite four and other ds ones after elite four
Shauntal Grimsley Caitlin Marshal
wifi battles battle subway dress up do elite four again link battle (if fiends have pokemon black or white)
You can fight Cynthia in black or white after you beat the elite four and ask for him/her at GTS.
go home get looker
You just get legendary Pokemon I guess
You get Reshiram at N's castle after you defeat the elite four.
You get the fishing rod at your home after the elite four.
Of course! It wouldn't be right without one ^-^
Yes. You can capture it after you beat the elite four.
Yes. You can capture it after you beat the elite four.
You can't get mightyena in black without trading. In white you can catch a poochyena and evolve it, but you have to beat the elite four.