As of Gen 9
-Partner Pikachu
-Partner Eevee
-Alolan Marowak
-Porygon, Porygon2, Porygon Z
-Galarian Slowking
-Vespiquin
-Cresselia
-Manaphy
-Victini
-Reshiram
-Zekrom
-Kyurem White
-Kyurem Black
-Zygarde all forms
-Kommo-o
-Necrozma, all forms
-Cinderace
-Morgrem, Grimsnarl
-Hydrapple
-Raging Bolt
Source: https://bulbapedia.bulbagarden.net/wiki/Signature_move
I’ll update this for a legacy list as well later
