Pixelmon Mod

I have made a custom map and had a friend test it's alpha stages, gym related trainers are once per player, How do I reset the data so he can play the release version?

delete his .pk and .comp files from the pokemon folder in the world save's folder

Thank you so much, I am so silly, I didnt delete the .comp data because it wasn't at the same time stamp as them logging off the server. I didn't put 2 and 2 together, It's resolved now you and the rest of the pixelmon team are the best!