What's buggy about Wrap moves in RBY? Well they do have bugs but there's nothing wrong with their primary intention of preventing the opponent from reacting. It's been argued to death by now anyway but statistics suggest AgiliWrap Dragonite is the only trapper with any serious potential for damage but since literally everything viable in RBY has a status move or Body Slam, except Cloyster who OHKOs with STAB Ice anyway, setting up unimpeded is not particularly easy. Then even if you do, you're still countered by Gengar and sometimes lose to your own inaccuracy. Not only do Normal and Psychic have the most OU mons (Water ties with Normal), and the better ones at that, they also have some of the best UU mons: Clefable, Dodrio, Hypno. No point rehashing what everyone already knows, though. Pretty confident in saying that Psychic is plainly better than Normal as well, as Psychic is basically guaranteed victory against the other 13 types where Normal can be contented with by a number of them, but Normal has no bad matchups and is the only thing that can throw down with Psychic directly. Flying is probably a surprisingly close third place, though. Of the remaining types, only Electric has any real shot at beating them. Even so, they share their best mon and it's hardly a guarantee. Rock's swept by Gyarados or Dragonite, Ground's swept by Gyarados or Articuno, Zapdos-Moltres destroy everything else between them. They might even be able to compete with Normal in a battle between the two, as Chansey doesn't wall most flyers and they have the raw stats to go toe-to-toe with Tauros without losing half their team. Even assuming Electric beats Flying directly, Electric itself auto-loses to Ground and Poison. Poison auto-loses to Flying, Ice, probably can't beat Fire either due to Tentacruel getting overpressured. Poison obviously gets completely destroyed by Psychic but both types are otherwise disadvantaged against Normal/Psychic. Water and Ice are the best of what remains and the latter doesn't even have six pokemon (even counting NFEs).