As you already know deoxys has a recruit rate of -10% So, you should have a 90+ Pokémon which means 14% recruit rate,, And if you wear a Friend Bow again +10% which means 24% But, you can do more! If you have lucario rank you gain +15% Which is 39% So after 3 times you should have him!! Happy Hunting
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When you recruit Lugia in Silver Trench, the next dungeon will be Meteor Cave, which is the place you can recruit Deoxys.
In Blue Rescue Team, you can recruit Magikarp in the dungeon Waterfall Pond, 7F-11F.
Go to Shimmer Desert floor 20 and you can meet Deoxys(You must bring a Secret Slab.)
First, you have to get a secret slab. Once you have that, go to shimmer hill, 13th floor and find Deoxys, defeat him, and recruit him.
In Joyous tower. But i recommend you to recruit a Combusken in fiery field
19 deoxys is on the the 20 (the real deoxys)
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.
Go to the guild and speak to wigglytuff, she will tell you about an island called Tryan Island that can be bought as a territory for members to rome in. Then find Deoxys and defeat him.
You may recruit Groudon after the end credits of the game.
Fight him alone with friend bow
well im notsure about it working but if you press a 2 times i if you are a level 100 you can just still something and adventule they will join but you need a friend bow or i doesnt work i havent got to deoxys sorry about that.