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A few of these Pokémon, as a result of new evolutions, become a part of evolutionary families with [[List of Pokémon with branched evolutions|branched evolutions]]. Those Pokémon which evolve into a Pokémon of a previous generation, instead of from it, are specifically [[baby Pokémon]].
The amount of cross-generational Pokémon introduced in each generation has been inconsistent. Generation II and IV introduced many new evolutions, Generation V introduced none at all and other generations introduced minimal amounts.