The full list of returning Pokémon in the Crown Tundra Pokédex is:
Generation One
Nidoran♀, Nidorina, Nidoqueen, Nidoran♂, Nidorino, and Nidoking
Zubat and Golbat
Electabuzz
Magmar
Dratini, Dragonair, and Dragonite
Articuno, Zapdos, and Moltres
Generation Two
Crobat
Elekid
Magby
Raikou, Entei, and Suicune
Lugia and Ho-Oh
Generation Three
Aron, Lairon, and Aggron
Swablu and Altaria
Lileep and Cradily
Absol
Spheal, Sealeo, and Walrein
Relicanth
Beldum, Metang, and Metagross
Regirock, Regice, and Registeel
Latias and Latios
Kyogre, Groudon, and Rayquaza
Additional returning Pokémon include:
Generation Four
Gible, Gabite, and Garchomp
Electivire
Magmortar
Uxie, Mesprit, and Azelf
Dialga and Palkia
Heatran
Regigigas
Giratina
Cresselia
Generation Five
Audino
Cryogonal
Tornadus
Thundurus
Landorus
Generation Six
Tyrunt and Tyrantrum
Amaura and Aurorus
Carbink
Xerneas
Yveltal
Zygarde
Generation Seven
Tapu Koko
Tapu Lele
Tapu Bulu
Tapu Fini
Source
