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Decidueye: Clearly the most popular starter of this generation, and a grass starter, so we would have a fire/water/grass triple combo of starters in Smash. Would probably play how many people think an archer from Fire Emblem would play, except he can fly. Final Smash would be Sinister Arrow Raid
Incineroar: Has less of a chance, on the count of being a fire starter and not the most popular starter, but we really don't have any wrestlers in Smash.Closest thing is Bowser, and that's just for a few moves. Plus he has the most vivid personality out of all the starters. Final Smahs would be Malicious Moonsault.
Decidueye/Torracat/Popplio: If they decide to ditch the 3DS support, we could see these three all in the same character, ala Pokemon Trainer. Obviously going with the most popular starters by form (Torracat's easily the most loved mid starter, Decidueye's most popular final form, Popplio's there because having all three) Final Smash would be Triple Finish, but with the typed Z Moves.
Lycanroc: Like Pokemon Trainer 2.0, if they decide to forego the 3DS support, we could see these two as a twin character, one a fragile speedseter, the other an up in-your-face kind of character.Final Smash would be Continental Crush.
Silvally: Very popular pokemon, would make for a very interesting four legged fighter. Could also be a Type: Null and become Silvally via Final Smash.