Thwackey

Thwackey's Grassy Surge enables the entire Grassy Terrain offense archetype and a variety of powerful Terrain sweepers, such as Oricorio-P, Uxie, and Hitmonlee. The Terrain it sets also supports Ground-weak sweepers such as Arcanine, Paldean Tauros-F, and Diancie while healing them. Thwackey uses Wood Hammer to chip down walls like Registeel and Alolan Muk that sweepers like Oricorio-P and Uxie have trouble with. It can also clean up games with Grassy Glide, picking off weakened foes like Cincinno and Swampert. Against opposing Psychic Terrain teams, Thwackey's low Speed is a benefit, as it underspeeds Indeedee-M on lead and sets its Terrain second. Thwackey's pure Grass typing benefits it against foes like Basculegion-M and Flygon but leaves it open to being taken advantage of by attackers like Munkidori, Alolan Ninetales, and Infernape. While Thwackey does have a decent Attack stat, particularly with Grassy Terrain-boosted STAB attacks, its niche is entirely on Grassy Terrain teams, as its stats make it simply incapable of standing up against the metagame on its own.