User blog comment:SnowyBoy/Team A5 ???/@comment-5088693-20120607162909/@comment-5088693-20120607165352

Oh, right. (Forgot to put that part in, haha.) I think it was said somewhere in the episode that Gouenji got it from the same person that gave it to Yuuichi, and Gouenji seemed to know who Dr. Arno was, so I think that the person that gave him the Time Bracelet was either Dr. Arno, or Tenma / Fey / Endou from the future.