I'm at the Elite Four now on white. This is my team:
Boldore lvl 45
Serperior lvl 50
Galavantula lvl 50
Musharna lvl 47
Darmanitan lvl 47
Caracosta lvl 47
Based on this team, I reckon I'm gonna struggle, but thats part of the fun of going with a somewhat unorthodox team (rather than saying oh hi there Haxorus, Thundurus, Chandelure, Archeops etc etc). I'm gonna get rid of Boldore once I'm done with the story and get a Braivary, the spec defense problem with Boldore/Gigalith is getting a bit too much.
My question is, what levels should I be aiming for before the league? I'm thinking 50, but should it be higher? If its higher I might ditch Boldore now and start on my Rufflet.