After you beat Darkrai do some guild jobs for about 2 or 3 days then Manaphy will come back and do another 2 days and Manaphy will discover a island paradise you will be able to go there then you completed the side story
Mostly, anything you want! You can look for treasure, become rich, try to acquire all special items, evolve pokemon, recruite pokemon, get IQ up, etc. But if you want to evolve, you have to let Manaphy join your team. After awhile, let Manaphy tell you about Marine Resort and the Ursarings will tell you something had happened at Luminous Spring. (This is for PMD Explorers of Sky, but i think it would work for the other too.)
you can either A: restart the game or B: complete the adventure log by collecting all the ledgendaries (mewtwo is in darkness and celibi in time) and also try to gain the master rank
honestly buy the guide book and find out..veronica
Get your rank up and use Spinda's Cafe to get new dungeons and explore them. There is no more storyline though...
you goto aziurll,you beat dakai,BALAGAA[A
Darkrai
lets you see darkrai in Pokemon mystery dungeon 2
Yeah Darkrai is in the Dark Crater dungeon on floor 13
lets you see darkrai in Pokemon Mystery Dungeon 2
never in history
miracle sea b3f or crevice cave b2f
Yes but after you complete the game. Including darkrai.
Darkrai probably has an advantage over you, or you are just EXTREMELY unlucky.
go to darkrai level and beat darkrai
It depends on Darkrai's level the higher the level the more HP.
No.
Unfortunately, shaymin and arceus don't appear in Pokemon mystery dungeon 2. It has every Pokemon from bulbasaur to darkrai, but not those 2.