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Froakie is a Generation VI starter Pokemon that features the Water type. It evolves into Frogadier and then into Greninja. Rowlet is a Generation VII starter Pokemon of Grass- and Flying-type.
The same applies to Froakie evolving into Frogadier and Greninja. Apart from the new costumed debuts, Pokemon GO Halloween Part 2 has also been speculated to mark the debut of Gigantamax Gengar.