Sadly no. But you can recruit Porygon at Spacial Rift, it is very rare. then evolve it using a link cable & upgrade then use the link cable & the dubious disc to evolve it again into Porygon-Z.
Yes you can recruit riolu in crystal crossing or crystal cave
Recruit it or get it as your partner if it's on the list of partners
Yes you can recruit him in both. He is in crystal crossing.
Miracle Sea and Surrounding Sea
you get them in missions. in surrounded sea you get manaphy, although you cant recruit him.
Recruit Palkia.
Yes you can recruit riolu in crystal crossing or crystal cave
No, there isn't.
no but you can, if you want to recruit it then i suggest you have something to make it easier to recruit Pokemon
Recruit it or get it as your partner if it's on the list of partners
they ask you if they can be on the tam
It may take several attempts to recruit legendary Pokemon in Explorers of Sky.
you cant recruit arceus he ain't a recruited Pokemon but when you get a space globe from his statue in destiny tower
you cant recruit him. there are only 492 Pokemon recruitible in the game
Yes you can recruit him in both. He is in crystal crossing.
Miracle Sea and Surrounding Sea
Happiny can be recruited in Happy Outlook.