Pokémon Mystery Dungeon Rescue Team DX is a little different from many other games in the Pokémon universe. You don’t play as a trainer and instead you play as a Pokémon. This makes catching Pokémon in the game quite different, as you can’t throw PokéBalls.
The first thing you need to do is unlock the ability to recruit other Pokémon. To do this, play through the game until you reach the third dungeon Mt. Steel. Once you defeat Skarmory, you will be able to recruit other Pokémon.
How to recruit Pokémon
Now, you won’t be able to recruit them straight away, as you need to provide your team members with somewhere they can live when they are not our rescuing other Pokémon. You will need camps that they can stay at, and different types of Pokémon need camps that match their type. To get your first camps, go and visit Wigglytuff in the town, and they will give you three camps for free. As long as there is room in the camp, and it matches the Pokémon’s type, you can now start recruiting the Pokémon that you find in dungeons.
When you defeat a Pokémon and your Team Leader delivers the final blow, there is a chance that they will join your team. If this happens, the Pokémon will join your team, effectively giving you an extra member. You then have to get out of the dungeon safely, and then you will have the option to permanently recruit them if you wish.
When you see a Pokémon that you want, make sure you deliver the final blow with your Team Leader. You can change Team Leaders by hitting the + button on your Joycon.