Not without claiming. Which I'll gladly do now.
I'm the Wii Fit Trainer. At night, I can invite someone to my gym, at which point for the following day and night, I'm in a masonry with them. In addition to that, I can also temporarily boost someone's "greatest potential," as well as getting a hint as to what that is (i.e., Strength, Deception, Logic, etc...) If I do boost them, I have to wait another cycle before bringing someone into my gym.
Right now, FRAYDO's in my gym, so you can ask him if you want verification.