Notes:

Mega Steelix:
HP 75
ATK 125
DEF 230
Sp.atk 55
Sp.def 95
Spd 30
Ability: Sand Force

Mega Glalie
HP 80
ATK 120
DEF 80
Sp.atk 120
Sp.def 80
Spd 100
Ability: Refrigerate

Mega Glalie is now the most effective user of Explosion. Formerly Lickilicky due to being the only STAB user of Explosion, bringing the attacks power to 375 coming off a base 85 attack.

Mega Glalie's Refrigerate now not only grants him STAB on Explosion, but a 30% boost as well, coming off a base 120 attack. It also hits all types now because of Ice.

Source