If explorers of time and explorers of sky are the same, I think you can't fight team Raider.
You can't.
Kill em'!!
After you have beaten the game, go to the beach south of the Guild Hall, Where you first met your partner. You'll find Team Raider standing there.
nothing they just stay at the beach
all they do is save dugdrio from drowning,and stand on the beach.
After the end of the main storyline, Team Raider can be found at the Beach, but I don't think you can battle them.
Lopunny, Gardevior, and Medicham (i think gardevior should get together with team raider's gallade)
they are the most strongest team this is the rating list in the Pokemon mystery dungeon game your playing 1st place:RAIDERS 2nd place:CHARM 3rd place:(whatever name your team is)
From what I have played, it's very likely that they are going to go on missions with you or anything.
your two Pokemon have to be level 99 and then talk to diglett bring him to his dad. team raider will sees you then you have to defeat them Wigglytuff appears and says:"WOW!!!That was amazing!" "I am promoting you to the MYSTERY RANK!" you get to do a lot of new missions in that rank
Team Raider is at the beach because Digletts dad, Dugtrio, was training at the shore and he was drowning so when Team Raider got there they saved Dugtrio.After that i don't know what happens, Sorry:(If anyone knows please post the answer to:"what do you do after Team Raider is at the beach?"