In Pokemon explorers of time how does turtwig evolve?

When you have prevented the planets paralysis, you get to graduate from the guild. Wigglytuff tells you about the 'Grand Master Of All Things Bad' which is actually him and the guid members exept Bidoof. When you defeat him at the end of mystifying forest, you will get to a place called luminous spring where you can evolve!! Hope this helps coz i got this from a friend coz i am stuck on defeating wigglytuff and the guid members.