Normally it just means that you can get all the legendary Pokemon to join your team. You have to venture out into dungeons, and on various floors, they will appear.
you can evolve your starter pokemon
Pokemon cannot be traded in the Mystery Dungeon series.
No.
Nothing
it will evolve into a better Pokemon
NO
Nothing special happens when you collect all 7 treasures. In Explorers of Sky, you get an icon on your profile and an entry in your adventure log. This does not happen in Time or Darkness though.
Nothing happens when you try to connect those two games.
there is no Pokemon mystery dungeon shadows of almia....
Yes, but only in Pokemon Mystery Dungeon: Explorers of Sky.
Pokemon cant on mystery dungeon
You can't breed Pokemon in the mystery dungeon games.