Nintendo was supposed to show all of this tomorrow but a leak forced their hands and it has decided to put Pokémon Sun & Moon's latest trailer up earlier than expected on its YouTube channel:

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You can see all the new and sort of crazy Pokémon that you'll be able to catch in this sequel. From a weird looking Piranha to a giant mouse-y Pikachu-y thing, it seems that the Pokémon Company is all out on this one.
Pokémon Sun & Moon is scheduled to come out on November 23rd and will feature four players battles.