For the Eevee evolutionary line in Pokemon. At minimum, the Generation 1 evolutions should be collectively present.

GEN 1: Eevee, Vaporeon, Jolteon, Flareon
GEN 2: + Espeon, Umbreon
GEN 4: + Leafeon, Glaceon
GEN 6: + Sylveon

Japanese term: イーブイズ