A new Pokémon Omega Ruby/Alpha Sapphire trailer is out, providing us with plenty of informative tidbits about the games. Three new mega-evolutions were unveiled: Mega Altaria, Salamence, and Lopunny. Horde encounters from Pokémon X/Y are also returning, and Nintendo has noted that this time enemy trainers might just throw out hordes for you to battle.
Pokémon contests originally debuted in this generation, but there's a special new contestant in the remakes. Cosplay Pikachu is a special Pokémon with the power to wear a variety of costumes. This will be useful in contests, but also makes a difference in battle. Every costume includes a unique move that Pikachu can't normally learn, so Pop Star Pikachu knows Draining Kiss, while Pikachu Libre knows Flying Press.
If the promise of Cosplay Pikachu isn't enough to inspire an early purchase, Nintendo will be distributing a shiny Beldum holding a mega stone starting Novembr 21. This will allow trainers to evolve the Pokémon into a shiny Mega Metagross.