From Bulbapedia, the community-driven Pokémon encyclopedia.
This is a list of Pokémon that evolve into a Pokémon originating from a different generation. For example, Pichu (a Generation II Pokémon) evolves into Pikachu (a Generation I Pokémon).
A few of these Pokémon, as a result of new evolutions, become a part of evolutionary families with branched evolutions. Those Pokémon which evolve into a Pokémon of a previous generation, instead of from it, are specifically baby Pokémon.
Mr. Mime family
| Level up with 2 Affection and a Fairy-type move
- Generation IV introduced the most evolutionary relatives to Pokémon from previous generations, numbering 29; Generation II introduced 19, Generation III two and Generation VI only one. Neither Generation V nor Generation VII introduced any new cross-generational evolutions.
- Roselia is the only Pokémon to have both a baby and an evolution (Budew and Roserade, respectively) introduced in the same generation.
- Sylveon is the only Generation VI cross-generational evolution.
- Porygon is the only Pokémon to have an evolution introduced in a later generation that was later able to evolve once again.