Normally you would not be able to recruit the evolved form of a Pokemon in mystery dungeon, especially the Eevee evolutions, though people have done it before. If you want an Umbreon, you'll have to recruit an Eevee first and then evolve it.
find it in a dungeon
you beat mystery dungeon red rescue team after you prevent the meteorite and defeat RAYQUAZA!
nope
Yes, there are Joy Seed Codes for Pokemon Mystery Dungeon Red.
you will find it in MT.FARAWAY which is 40 floors at the peak you find ho ho
find it in a dungeon
You find Kyogre at Stormy Sea on 40F.
Tiny Woods
You can find one in Solar Cave.
You have to be lucky and find them random in dungeons
wondermail
you beat mystery dungeon red rescue team after you prevent the meteorite and defeat RAYQUAZA!
in the sky tower
nope
ya it works
they are on the floors of higher leveled dungeons.
you use rock smash