Can you get Dialga in Pokemon Mystery Dungeon Explorers of Darkness?

I think you have to go to temporal tower, you go up it (it's really tough) and you fight dialga. He doesn't join you though...

hi I'm fluffyeevee yes he can join your team after you beat the game

sorry i cant tall how to get him because i erased my data beat the game agen.....but......i cant remember how to get him sorry

END OF TEMPORAL TOWER approx 21 stories to get to him

After defeating Primal Dialga, (and stocking up on Reviver Seeds, Max Elixers and Oran Berries) go down to the beach where Lapras is. Let him take you to the Hidden Land and then to Temporal Tower.