Necrozma, Project Pokemon Wiki

Necrozma is a LegendaryPokémon introduced in Generation VII. It is known as the "Prism Pokémon". In order to obtain Necrozma, you need 6 other Ultra Beasts (There are a total of 11, but only 6 will work). You need to have them all in your party, then go to Snow Canyon. After that you go up the tall "mountain" and interact with the gate. If you hadn't done this before you may have to battle against the trainer Red. It can also be obtained from trading.

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