Do you mean like that?
"I edited the team of the E4 champion.
I gave him 5 Perma-Méga (+ his Metagross with its Mega Stone), all Level 100 and Max IV. So he have 5 PermaMéga + his Mega-Metagross.
And my team is 6 Pokemon, AND EACH WILL MEGA EVOLVE.
I can make 6 Mega Evolutions in the same battle.
I lost, but this is because I want have the time to Mega evolve all my pokemon for show you 6 mega evolutions in the SAME battle.
If I'm serious, I win easily, even vs the team I gave him.
It's a gateway cheat (not mine, thanks MM), I tried it in NTR cheat plugin, it work too."