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Emerald is Gen IV because it added a new Deoxys form.
Gale of Darkness is Gen V for adding Munchlax and Bonsly.
This means Diamond and Pearl were Gen VI, and Platinum was Gen VII for adding a new Giratina form.
BW were Gen VIII, and B2W2 were Gen IX for adding Kyurem forms.
XY were Gen 10 and ORAS were Gen XI for adding new Megas.
Therefore, USUM are Generation Thirteen (XIII) for adding new Pokemon and new forms.
