Let's see, off the top of my head for "they certainly exist" with a liberal dash of "who the hell cares about stage 2"
Grookey -> Rillaboom
Sobble -> Inteleon
Scorbunny -> Cinderace
Zacian/Zamazenta
Eternatus
Kubfu/Urshifu
Calyrex/Glastrier/Spectrier
Dreepy -> Dragapult
Toxel/Toxtricity
Wooloo/Dubwool
Rookidee/Corvisquire/Corviknight
Galarian offshoots for Meowth, Zigzagoon, Linoone, Yamask, Corsola, Farfetch'd, Ponyta, Rapidash, Mr. Mime, Articuno, Zapdos, Moltres, Weezing
Purrserker, Obstagoon, Runeregis, Cursola, Sirfetch'd, Mr. Rime
Snom/Snomoth
Clobbopus/Grapploct
Cufant/Copperajah
Arokkuda and Barraskewda
Cramorant
Eiscue
Stonjourner
Morpeko
Baby fluff hat -> Hatterne
Impidimp -> Stabby dark fairy
Falinks
The abomination fossils (Dracozolt/Dracovish/Arctozolt/Arctovish)
Sizzlipede/Centiskorch
?! -> Coalossol
Sandaconda and Silicobra
Look, my memory ain't perfect, but that's not too bad, right?
EDIT: Not bad looking at the "complete" list.
[The Artist Formerly Known as Earthshaker.]