Pokémon Mystery Dungeon: Gates to Infinity
In Gates to Infinity, the game starts with the player having a strange dream. They hear a Pokémon cry out for help, and they have a vision of Hydreigon chasing Munna. The player realizes that they have been turned into a Pokémon, and they are taken to the Pokémon world. When they arrive, they meet their partner Pokémon, who wants to know where the player came from. The adventure begins at this point.