Mega Gengar confirmed to have Shadow Tag ability.
Mega Tyranitar confirmed to retain Rock/Dark typing with Sand Stream ability.
Mega Aggron confirmed to be pure Steel-type with Filter ability.
Clefable is Pure Fairy-type
You battle your rival in Kiloude City. Afterwards you get given an Absolite and sent to Sycamore who is in Anistar City. He will upgrade the Mega Ring to allow for detection of Mega Stones.
The Mega Ring will only react to hidden Mega Stones after 8pm
Mega Pinsir is Bug/Flying-type. It has the ability Aerilate which turns Normal-type moves into Flying-type
Mega Stones can only be found between 8pm and 9pm
Mega Banette is Ghost-type. It has the ability Prankster
You find Looker later in the game and he hires you as his assistant to investigate things in Lumiose
Whimsicott is Grass/Fairy-type
Weight now plays a factor in the move Sky Drop
Blizzard, Thunder, Fire Blast, Hydro Pump, and Hurricane: Reduced to 110 base power.
Ice Beam, Thunderbolt, Flamethrower, and Surf: Reduced to 90 base power.
Bubble: Increased to 40 base power.
Frost Breath: Increased to 60 base Power.
Fury Cutter: Increased to 40 base power.
Hidden Power: Base power is now 60 (no longer dependent on Pokemon's IVs).
Low Sweep: Increased to 65 base power.
Rock Tomb: Increased to 60 base power & 95 accuracy.
Moonlight, Sweet Kiss & Charm are Fairy-type.
Will-O-Wisp's accuracy has been increased to 85%
Mega Pokemon gain an increase of 100 in stat total. Example - ST 485, MEvo ST 585 (Mega Mewtwo X/Y is 780 BST. Suck it Arceus :p)
Arceus needs a new item called "Pixie Plate" in order to turn into a Fairy type.
Faint Attack has been renamed "Feint Attack".
Pumpkaboo and Gourgeist's base HP, Attack, and Speed change depending on its size.
Houndoom is exclusive to X, while Manectric is exclusive to Y.
Mega Houndoom gets Solar Power as its ability
Mega Manectric gets Intimidate as its ability
Mega Heracross gets Skill Link as its ability
Houndoomite and Heracrossite are exclusive to Y, while Manectite is exclusive to X.
Woah!! Thats alot of changes they did their .
And looking at the last "spoiler" it seems your pokemon can have up to 5 moves now. Man thats something!