Type: Ice
Classification: Face Pokémon
Height: 2.1m
Weight: 350.2kg
Ability: Refrigerate
The excessive energy from its Mega Evolution gushes out of its mouth, blasting away and destroying its jaw. It is no longer able to close its mouth, and the freezing air it emits becomes far stronger. It tosses foes into its gaping mouth, expelling a burst of chilled air to freeze them instantly.
When Glalie Mega Evolves, its Attack and Sp. Atk stats get a considerable boost. Its Speed stat also increases but not as much as the two offensive stats. It's ability is Refrigerate, which makes Normal-type moves into Ice-type moves.
Reference and images: Serebii.net
Additional references, images, and information: pokemonrubysapphire.com