There are a few steps involved in getting this trophy.
First, you need to have purchased Sonar Shot from Trowzer. After you have done that, you need to use the move on the totem behind Trowzer to show you a platform that you can use to get to the second floor.
Once on the second floor, look out to find a series of platforms that you need to take out to a pillar on the end. On this pillar is Mollycool.
After getting Mollycool, drop down to find Dr. Puzz. Speak with her and give her the Mollycool. You can then step on the platform and press
to be transformed.