Yes, yes you do.
nothing
nothing. you just beat it 2 times and that's all.
If you beat the elite four 100 times you don't go to heaven but you do get to join the elite four. They get harder and you can fight them whenever you want. You also fight trainers with level 100 Pokemon and you still get exp points.
beat elite 4 5 times then beat 30 different trainers isn't that good
No mystery event only sorry...
you have to beat the elite 2 and go up down left and right 123456789 times
After you beat the elite four you... Gotta Catch'em All! Gotta Catch'em All!
beat the elite four and the champion.
After you beat the Elite Four.
beat the elite 4
You have to beat the elite four
you have to beat the elite four then wen you come out he will be there