Southperry Pokemon League.

You have 10 pokemon, you could just put Mawile on standby until you reach the Elite Four.

adding to razmos, you can also switch items around as much as you please

To be honest, I might use the 4 extra slots just in case someone wants to have a double battle. It might make my team a bit worse off if they are put in a double battle instead of 1v1. That said, I wonder if anyone so far has went against a GL that has done a double battle. That way, I might not raise another M.Mawile (or change up my moveset for other pokemon) just for that. I'm not here for the prize or anything. Just here for experience. :T

Mega Mawile Sucker Punch is much scarier than a regular Mawile Sucker Punch. There's no comparison.

>:3 I had fun with the Salamence/Mawile intimidate tag team. Find a phys attacker, double switch to salamence (hopefully they are using EQ) then to Mawile and then set up to sucker punch 3-4 pokemon out.