In Pokémon Brilliant Diamond and Shining Pearl it's possible to receive a Mew and Jirachi from having a save file for previous games in the series. These are Pokémon: Let's Go Pikachu and Eevee or ...

In Pokémon Legends: Arceus you can get the mythical Shaymin (Land Forme) and unlock the Shaymin Kimono Set by having a save file from a previous instalment in the mainline series. These games are ...