Here are all the fossil Pokemon (as of November 2015):
Yes You Can Get A Pikachu In Pokemon X and Y.
Jaw Fossil is a type of fossil in Pokémon X and Y that can be revived into the Pokémon Tyrunt, a Rock/Ice-type dinosaur-like Pokémon. Players can obtain the Jaw Fossil in the game and take it to a specific location, where it can be transformed into Tyrunt. This Pokémon is known for its strong jaw and teeth, reflecting its fossil origins.
The Legendary Pokemon available in Pokemon X/Y are:Xerneas (X only)Yveltal (Y only)ArticunoZapdosMoltresMewtwoZygarde
Pokemon X and Y are sold at MSRP of $39.99 (CAD)
In Pokémon Y, the Claw Fossil is restored into the Pokémon Anorith. Anorith is a Rock/Bug-type Pokémon that evolves into Armaldo. To revive the Claw Fossil, players must visit the Fossil Researcher in Ambrette Town.
No, you can only pick one per version. You will need to trade for the other fossil Pokemon to complete the collection in Kalos. The Sail Fossil is Amaura, the Rock/Ice-type Pokemon, and the Jaw Fossil is Tyrunt, the Rock/Dragon-type Pokemon.
In X and Y, The Fossils can be revived in the Fossil Lab in Ambrette Town. !!
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Prof. Sycamore will give you the oval charm in Pokemon X and Y.
Pokemon capable of learning Psywave as an Egg Move in Pokemon X and Y are Latios (Pokemon) and Gastly (Pokemon).
I believe X is stronger, but Y looks cooler.
*Mew is not catchable in Pokemon x and y, but you can get him online from wondertrades and such. Mewtwo however, is catchable and you can find him in the cave in pokemon village.