Same, I dislike Incineroar. He doesn't have much appeal at all and it shows, scoring dead last in his last evolution form (I think his first kitty form did better). To be fair, Decidueye's archetype has already been done several times in Smash. Primarina would've prob been the better choice between her and Incineroar but... honestly? You say "Pokémon Sun/Moon" to me, I think...
Nebby.
Why the HECK didn't they make Nebby playable?! He's the ONE Pokémon that represents Sun/Moon the BEST!! He could transform into his sun or moon form to smash then revert back, as for his other moves he could:
- teleport (up-B)
- sunsteel strike/moongeist beam depending on last form used (from smashes, maybe other moves too?), ignoring shields - the former rushing in, the latter sending a beam (side-B)
- create 2 linked wormholes behaving like those from the game Portal (neutral B)
- Cosmic Power, giving him limited super armour (down-B)
Boom! How unique is that for you?! As for whether it'd be OP? No. Wormholes would require time to be properly set up. Well used they'd be good (to deny a path or reposition for a surprise attack) - but not broken. For his side-B, well Charizard's side-B has a startup delay, it'd be the same here... and you could dodge then punish, or play aerial where shields don't even exist.
Lastly limited super armour require time to set it up then you still take the damage. Nebby would be very floaty, so it'd still be a bad idea to get hit too often - a grab, throw => dead. Main uses would be safely recover, safer approach and kill confirms. Counterplay: kite him, use it up, ???, profit.
In other words, it'd be like a Jigglypuff that has weaker pressure and air game, making up for that by more utility and tricks. See? I came up with that just now, that's how much potential Nebby has!! As for my improvised kit, it's something Smash doesn't have, mechanics that would make people want to play him without overshadowing existing characters, a Pokémon that is loved by a great many... I just don't get it. Why Incineroar? Why??