My son's friend borrowed his Pokemon Platinum game. He started a new game and my son lost all of his 80 or so Pokemon. Is there any way to retrieve them?

Sorry but once you start a new game the data from the previous game is completely deleted..

nope

Sorry, I don't think there is a way to get them back. Believe me I've tried, my Emerald hates me and restarts itself all the time. But good luck to your son!

Well, the best way to put it is no. Once the game data is gone, it's gone.

perhaps if u connect it 2 the comp & start hacking & all maybe but i dont kno if thts even possible. try asking a computer genius.

I don't think u can get them back but just tell your son that he can catch all of them again!
I don't know your son but i always think the best of things so...Good luck!!!!!!!!!!:)

action replay

Sorry but no. If I know your son then I will give him my Pokemon Platinum. Maybe it's not a good idea to not let his friends borrow his games. A true friend won't do that.