As I said in the Coro Coro thread, I believe the nerd guy is actually an electric type gym leader (though I would have preferred steel, since we already had Elesa last gen). On his backpack mecha-thing is what looks like a parabolic array shaped like a sun, which goes perfectly with Helioptile as a pokemon, (electric energy converted from sunlight). I highly suspect he will have helioptile or its evolution as his signature pokemon. Also in the background of his gym is what looks more digital (electrically sent information) rather than mechanical (moving parts of metal, etc.) which also lends itself to electric rather than steel.