I love the new Pokken Support Pokemon sets. Especially the Espeon and Umbreon one. As someone who grew up playing Pokemon Collosseum (And ended up frying their GameCube because they didn't want to turn it off because they didn't know how to save) getting to see that duo again is absolutely amazing. Now, as for who I'd love to see, basically whatever is left of my favorite Pokemon. Here's my three most wanted of each Generation, with two who I'd love to see as support.
Generation I: Arcanine, Zapdos, and Nidoking as playable. Maybe Sandslash and Fearow as support.
Generation II: Scizor, Feraligatr, and Heracross as playable. Maybe Bayleef and Houndoom as support.
Generation III: Swampert, Aggron, and Flygon as playable. Maybe Camerupt and Sharpedo as support.
Generation IV: Gallade, Empoleon, and Toxicroak as playable. Maybe Staraptor and Luxray as support.
Generation V: Zoroark, Genesect, and Serperior as playable. Maybe Pawniard and Krookodile as support.
Generation VI: Chesnaught, Greninja, and Noivern as playable. Maybe Tyrunt and Hawlucha as support.