This may have been the first thing you thought of when you heard about Metal energy, but, this is incase you didn't. First, get a Chancy in active. Then attach 2 metal energy to it ( I know it will be hard. ) Then, Scrunch! 50% chance of invincability, and 50% chance of your opponant attacking 140hp! Energy Removal going to beat you? Eco Gym. You now have a 140hp pokemon with a 50% chance of invincability. As I said, the ultimate stall.
I don't know if Chancy is 1 of the pokemon being banned. I hope not.
 
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Sir Stoise.