Decided to make a thread instead of re-posting it. Going by Generation and not by formats, so Pokémon that got cards only before Ultra Prism still count.
Kanto: Abra, Kadabra, Alakazam
Johto: Sentret, Furret, Pichu, Bellossom, Smoochum, Elekid, Magby
Hoenn: Zigzagoon, Linoone, Castform Sunny...