Ghetsis & Kyurem

Ghetsis & Kyurem are a pair that can do quite a few things, but not exactly everything at once. First, he provides a valuable Ice-type that doesn't have many strong accessible options, with the main one, Pryce, only achieving his highest potential when paired with Ghetsis himself. Starting on the offensive part, Ghetsis has a 4 gauge AoE Ice move in Glaciate, which also guarantees a Speed drop for the opponent. Due to it being a 4 gauge move on a slow Pokémon, this means that Ghetsis tends to want strong gauge support, but it also means that his DPS will reach a decent number, as it also has multipliers such as Hunter's Intinct and Paralysis Synergy. Ghetsis can also Sync Nuke with his innate Sync multiplier and Pecking Order - while Speed drops doesn't tend to be a good condition to have, Ghetsis dropping it in area while using it as a best move and having partners that also can drop Speed makes him an exception. Cold Snap 2 also allows Glaciate to freeze all opponents at the same time with a decent rate, working as a pseudo-Go Viral Hypnosis that does damage but with less accuracy. Finally, Ghetsis' Double Drop Noble Roar makes him the premier support for units that have both Devastation and Pecking Order, such as Anniversary N and Champion Iris, and can also be useful to take on end-game contents that might hit hard, such as Extreme Battles. Although Ghetsis can't do everything at once, those multiple niches with their own utility makes him a valuable unit to have.