Gen3 and 4 evolutions

Weavile, gliscor, mamoswine, are a few

Rhyperior, given Rhydon's already absurdly high CP.

Tangrowth, Magmortar, Electowire, Togekiss and Magnezone are all strong - New eeveelutions (Glaceon and Leafeon) are also neat, so keep some spare high iv eevees!

I forgot Mismagius, who brings some ghost dps on the table.

No gen 3, a bunch of gen 4

my understanding is that gen 3 is completely stand alone so if the release them in order you wont see new evolution's for about a year.

You may like this...

https://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_with_cross-generational_evolutions