After you have Manaphy joined your team[you must first beat Darkai]do some optional missions.Then Manaphy will come to your house and tell about Marrine Resort.
You can't. You do get to go to Fiery Fields on Mystery Dungeon Blue and Red version.
In the actual story, you have to defeat Darkrai. However after that Manaphy will wan't to join the team, and he will unlock a dungeon called Marine Resort.
You can find Wonder Gummis at Marine Resort. You can also get them as rewards for completing certain missions.
in concealed ruins 20f if you have a mystery part or a secret slad (works only if you already can go to marine resort)
No,arcus is not in mystery dungeon 1 or 2
No.
Mystery Dungeon 3 isn't out yet. And no, they won't work.
The land, Pokemon, and dungeons are extremely different.
You don't!!
there is no shaymin (or arceus) in mystery dungeon 2. in Pokemon mystery dungeon explorers of the sky (check out serebii.net for that), there is shaymin and arceus, but i don't know if shaymin is recruitable.
Arceus and Shaymin are the only two Pokemon of the series not to feature in Pokemon mystery Dungeon 2
Pokemon Mystery Dungeon 1: Red Rescue Team/ Blue Rescue Team Pokemon Mystery Dungeon 2: Explorers of Time/ Explorers of Darkness