How do you recruit Groudon in blue rescue team?

You can't recruit Groudon in Pokemon Mystery Dungeon: Blue Rescue Team. Groudon is a legendary Pokemon and doesn't appear in the game.

The legendary Pokemon available to recruit in Blue Rescue Team are:

* Rayquaza: Found in the "Sky Pillar" dungeon after completing the main story.

* Dialga: Found in the "Timegear Tower" dungeon after completing the main story.

* Palkia: Found in the "Space-Time Tower" dungeon after completing the main story.

If you're looking for Groudon, you'll need to play a different Pokemon game, like Pokemon Ruby, Sapphire, or Emerald.