Riku isn't a super nerd, but he has done a metric ton of research on Pokémon and has a very large selection of species if Reid wanted to examine some of them. One includes a technically extinct Pokémon, but due to Terror's viciousness, he'd be very, very hesitant about lending her unless Reid had something that could stop her in her tracks, like Thunder Wave or Hypnosis.

He's also been in the game since it started, so he has loads of personal experience on odditites like the MISSINGNO. incident.