I'm looking for a book I read in the 90s: The protagonist was a teenage boy who was actually a human-like alien with MIND POWERS. He came to earth to investigate a laboratory, which was full of other teenagers with psychic powers. There was some kind of "psychic fence" around the place to keep them from leaving, and it turned out the other kids didn't have natural powers, the Evil Doctor had implanted them with microchips in their brains to give them psychic powers.

EDIT: Found! See replies