>>32385610Decidueye: mixed attacker with decent defenses and an excellent signature move in Spirit Shackle to trap opponents, has many good utility tools to exploit the trapping effect like Swords Dance, Baton Pass, U-turn, Haze, Leech Seed and Defog. Very solid physical movepool as well but poor on the special side, which is a bit of a waste of its good Sp. Atk.
Incineroar: one of the few bulky fire types, works like a slower but stronger and bulkier Arcanine, when Intimidate is released he'll be even better. Solid movepool, decent signature which allows him to ignore defense boosts allows him to wallbreak, and also a few but nice walling tools like Taunt and Will o Wisp.
Primarina: slow special wall with excellent offensive and defensive typing and huge (for a starter at least) Sp. Atk stat with decent offensive movepool, both her signature move and unreleased ability allow her to bypass Substitutes with Stab and good Base Power moves, but other than that her signature has the least useful quirk out of the three. Held back as a wall by lowish physical Defense and lack of reliable recovery and as a wall breaker by low Speed and lack of boosting moves.
Overall they're all good in their own merit and fill interesting niches.