While they appear as bosses in the game, they are not recruitable. This is because they are legendary Pokémon and not considered part of the regular Pokémon roster that you can encounter and befriend in the game.
If you are looking to recruit other strong Pokémon, there are many options available, including:
* Evolving existing team members: You can evolve many Pokémon in the game to unlock powerful forms.
* Finding rare Pokémon in specific areas: Some Pokémon are only found in certain areas, like rare Pokémon dungeons or certain levels.
* Using the "Friend Area" feature: You can interact with other players and trade Pokémon to add them to your team.
Remember, exploring the game's dungeons and befriending various Pokémon is a key part of the fun in Pokémon Mystery Dungeon. Enjoy the journey!