The Marowak placeholder glitch Pokémon appear in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, in the place of past Pokémon (in addition to the original 151 and Meltan, Melmetal) which do not appear in the game. The Pokémon may have the same typing as the equivalent past Pokémon.Project Pokémon - Unused Let's Go, Pikachu and Eevee content thread
In Pokémon Sword and Shield, a similar Pikachu placeholder glitch Pokémon can appear.