Pokémon - New Mega Evolutions

Oh god I'm so torn apart as to which Mega to choose for my team
Sableye is one of my favorite Mons and gets Magic Bounce, great for the set ups
Metagross has all of its stat except HP increase
Lopunny becomes dual Fighting and gets Scrappy as an ability, top tier Aegislash counter
Altaria becomes Fairy and gains immunity to Dragon as well as increased Ice resistance
Salamence gets Aerilate and STAB Double-Edge and Trash, as well as possibly Extremespeed
OHGODOHGODOHGODOHGOD-

somebody for the love of pokemon gods, name their mega salamence "Nyoom"