Do you have all 8 badges? Did you cheat those Pokemon in your game cause if you did that's why they don't listen.
Level 300
The Elite Fours Pokemon are all in their 50s. The Champion at the end of the Elite Four has 60s though.
Well,Level 70-100 Is A Good Level To Beat The Elite 4.
A good starting level for the elite four is 53-100 because i could not beat it until all of my Pokemon were level 54.
the same
get one pokemon to level 100
Elite 4
No, you can just train your Pokemon against wild Pokemon to level up. But it's a little quicker going against the elite 4 cos their Pokemon are higher level than wild Pokemon.
On at least level 50.
level 100
I would suggest having your whole team above level 50 so you have a chance to beat the Elite Four. I think the Elite Four Pokemon are at level 50-60, so well trained level 50 Pokemon will be good for the elite four.
an level hundred