Seems like the highest backfire is that your bro will get the Wii U and won't share with you.
I'm still looking for a really good Mega Heracross set, preferable doubles. Someone please ;-;
Pin Missile, Rock Blast, Arm Thrust/Close Combat, Protect.
Pair it with Tailwind Talonflame to sweep everything.
Or play it in Trick Room to also sweep everything. Just be careful with this strategy. Mega Heracross isn't nearly as slow as most Trick Room teams.