Black and White 50+

I beat Elite 4, N and Ghetsis and now my party is lvl 50-60 but I cant beat the elite 4 anymore. I beat most trainers between 8th gym city and white forest. Anywhere to level up to 70 so I can battle Elite 4 again?

Replying to #1

You should start defeating the Trainers at Route 11. They are around the 60s, but I'd advise to use Zekrom/Reshiram (Depending on Version)/Starter Pokemon.