/nerdgasm
Now if every Mega Evolution gets a X and Y I can dig this
So Charizard Y is a more specially based attacker with Drought (now not exclusive to Ninetails in non Uber)
And Charizard X is a more physically based attacker that now has Dragon type (fans rejoice)
Mega Evolution advantage:
Positive Stat change
New Abilities
New Type leads to change in STAB / resistances
Mega Evolution disadvantage:
Loss of using any other holdable item
Negative Stat changes
New Type leads to change in STAB / weaknesses