Aggronite

As an a additional casting cost, sacrifice Aggron
Summon Mega Aggron from your hand
deck or graveyard and attach this card
to it (Can't be unequipped from Mega
Aggron) Equipped creature gets +2/+2
One variety of the mysterious Mega
Stones. Have Aggron hold it, and this
stone will enable it to Mega Evolve during
battle.