For the unobtainable Pokémon in Pokémon Legends: Arceus, it lists Galarian Articuno, Galarian Zapdos and Galarian Moltres as all being Electric types with Galarian Slowking and Galarian Meowth being Bug/Electric and Grass/Dragon respectively. Galarian Ponyta, Galarian Rapidash, Galarian Slowpoke and Galarian Slowbro are all Rock/Flying. Galarian Weezing is a Ground/Steel type, Galarian Farfetch’d is a Rock/Flying type and Galarian Mr. Mime is a Ghost/Fairy type.
The correct types for all of them should be Poison/Psychic, Psychic/Fairy, Dark/Flying, Fighting/Flying, Psychic/Flying, Fighting, Poison/Fairy, Steel and Ice/Psychic.