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BW/B2W2:
Serperior
Hydreigon
Volcarona
Jellicent
Excadrill
Reuniclus
Starters fucking suck, but at least Serperior looks nice and Gen 5 was chock full of great Pokemon. No Haxorus because Hydreigon gets priority. Rest are mainly there to cover types while trying to overlap as little as possible. Almost anything from Gen 5 could go under Volcarona, really.
XY:
Greninja
Goodra
Aegislash
Talonflame
Heliolisk
Florges
Greninja is a fucking great starter and my second to Swampert, I'm pretty sad the Special manga gave the Water starter slot to BW2's protag. Aegislash is fucking great and Talonflame is crazy strong despite being an early game bird. Pity Gen 6 has so few pokemon, the rest is mainly trying not to overlap.
Oh yeah, and for RBY Gyarados could be replaced with Lapras and Gengar maybe Flareon for Eevee. Trying to make teams of Pokemon notable of their generations yet great in battle.