It's worth noting that there are some new mechanics in this game too, making it pretty much a brand new game. Thunder wave doesnt affect electric types, powder moves dont effect grass types etc.
Egg moves from gen 6 are on most pokemon too (moves that exist in gen 3) if you need some help learning about the gen 3 meta as well definitely check out http://www.smogon.com/dex/rs/pokemon/ most importantly have fun and say whats up to me in game if you feel like it! Ign: Xatu