switch it to the first position, and keep changing it with your stronger pokemon so it gets experience.
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Train Your Pokemon- (Train till level 60 above,sure can one)
Capture all legendary, train all Pokemon to level 100, Max out stats,
Well,Level 70-100 Is A Good Level To Beat The 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.
I would train all your Pokemon until they are all about level 75 or a little less.Hope I helped:D.