i can only tell u about what Pokemon i used as there is alot of differrent ones u could use so i used a:
palkia lv60
dialga lv63
lucario lv65
torterra lv60
infernape lv67
empoleon lv70
beat the league and he will be gone
beat the Pokemon league
beat the Pokemon league
You can beat the Pokemon League it is just one of the harder Leagues than in Pokemon Emerald or Diamond.
u hav to beat the Pokemon league
At the fight area (after you beat the Pokemon league)
I beat the league on Pokemon Diamond version, and there was no cave involved, if that's what you were asking.
beat the league
You need to have beat the Pokemon league and completed the sinnoh dex
Yes in turnbackcave on the spring path after you beat the Pokemon league
Beat all the elite four and there champion
You beat the league. If you mean the snowpoint temple all you have to do is beat the Pokemon league but if you want regigigas you need regirock, regice and registeel