Beat the game. The easiest way would be:lvl 100, Item: Friend Bow, Rank: Lucario Rank. Everyone says ranks don't affect well they do.
In Blue Rescue Team, you can recruit Magikarp in the dungeon Waterfall Pond, 7F-11F.
I believe if you look at red rescue team it is the same.
recruit ho oh
You can recruit Registeel in Pokemon Mystery Dungeon Blue Rescue Team but his recruit rate is 0.01 percent. Registeel can be found at the Buried Relic and his friend area is the Ancient Ruins.
You can't recruit any Pokemon at the Makukita Dojo.
you cannot recruit Pokemon for completing missions in blue rescue but u can recruit via missions in time and dark
You get it when you recruit Ho-oh though I am not sure if you have to recruit it or just beat it
You may recruit Groudon after the end credits of the game.
All you have to do is defeat them and if you have their friend area they might join your team. (No promises!)
theres a certain code not sure what though
recruit articuno zapdos and moltres
after you recruit zapdos, articuno, and moltres.