Legit trading? I'd say mainly UC babies, mutants, maybe halloween, probably with a similar name format. If you want to trade up aim for the best name format you can get, the PC can be very prissy about names, especially among the 'lower' UCs, and they can often get you higher trades than the species of pets deserve. You could also go the route of trading for a draik with a really good rw/rn and trying to trade back up from there.