Yes.
To get him, keep doing missions at Spinda's Cafe. You could either get a regular mission or a mythical mission. Myth Missions have legendaries (50% recruit chance) and one is Groudon. The list of Myth Mission Pokemon is here:
Zapdos
Mew
Kyogre
Groudon
Rayquaza (must of completed Groudon and Kyogre missions)
Heatran
Giratina
Staraptor Lvl 65 (Though he's not a legendary, he's extremly powerful and unrecruitable)
Mewtwo (must own Secret Slab)
Hope I helped :)
It may take several attempts to recruit legendary Pokemon in Explorers of Sky.
they ask you if they can be on the tam
No, there isn't.
mission recruit or egg
Miracle Sea and Surrounding Sea
Take it as your partner Pokemon or recruit him at end lake
no but you will find the statue of arceus
arceus garitina darkria groudon dragonite
you cant recruit him. there are only 492 Pokemon recruitible in the game
crevice cave and blizzard island, after you beat dialga
you cant recruit arceus he ain't a recruited Pokemon but when you get a space globe from his statue in destiny tower
you get them in missions. in surrounded sea you get manaphy, although you cant recruit him.