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.
Fight Darkrai
its marine resort
Darkrai
Buy friend areas. The last dungeon is the deoxys one
The last boss in Pokémon Mystery Dungeon: Explorer of Time is Dialga. After that boss you get the credits list and it says "The End". But it's possible to keep playing after that.
It is called "In the Future of Darkness."
49f liar
That's the last event. After that, get all of the Pokemon to join your rescue team.
The last rank is ultimate I believe. :3
You have to use the stairs to reach the last floor.
Last two floors of uproar forrest or western cave.
if this where you coleced the scale frome the 3 lengdery bird the answer is 99 floors so bring a lot of reviver seed when get to the last floor lugia is wating for you The last answer is wrong, because the answer above is for Pokemon Mystery Dungeon Blue Rescue team and Red rescue team. The real answer for Pokemon mystery dungeon explorors of Darkness/Time/the sky is 49 floors plus the bottom.