As of Generation 9, the best Rapid Spinners are the paradox Donphan forms, Great Tusk and Iron Treads. With its massive 131 Attack and Defense, Great Tusk can exert a powerful offensive presence even if its main role is to clear hazards. The speed boost it gains from Rapid Spin also allows for a potential endgame cleanup thanks to its great STAB combination of Ground/Fighting and useful coverage moves, such as Ice Spinner for Landorus-T and potentially even Temper Flare or Supercell Slam for Corviknight. It can also choose to run Stealth Rocks itself, meaning it can both set up hazards and clear them for its team. Tusk also has tons of variety in its EV spreads, since it can be geared to be fully offensive, fully defensive, or to give a +speed boost with Protosynthesis. Finally, the Protosynthesis boost under Sun or with Booster Energy can make it even more threatening, often making it stronger, bulkier, or faster.
Iron Treads has a few traits to differentiate itself from Great Tusk. Although weaker, its Steel typing allows it to have valuable resistances along with an immunity to Toxic. It is also faster at base 106 Speed, which is crucial since it outspeeds the crowded base 100 benchmark. For reference, Great Tusk sits at base 87, which is slower than certain mons like Landorus-T and Iron Crown, but Iron Treads outspeeds them both. Iron Treads also has Volt Switch, allowing it to ease prediction and give its team momentum. In sum, Great Tusk is much more offensive and has great set and EV spread variety, but it is slower than many mons along with lacking the option to pivot. Iron Treads is weaker and doesn't have as expansive of a movepool, but it is quite a bit faster along with offering a Toxic immunity and pivoting. Both are able to spin hazards incredibly reliably, provide an Electric immunity, and have the option to set their own hazards up in addition to removing them.
There are some other notable Rapid Spinners. Currently, in National Dex, Terastalization is banned, meaning Terapagos is unbanned. Terapagos's Tera Shell along with great coverage afforded by Ice Beam, Flamethrower, and Earth Power allows it to both pose a decent threat to most mons and remove hazards more reliably than any other mon (until Tera Shell breaks). On Sand teams, Excadrill is commonly seen as Rapid Spinner, as it already is a premier pick to be the dedicated Sand sweeper. It's immense threat level afforded by Sand Rush + Swords Dance along with a quadruple resistance to Stealth Rock and an immunity to Toxic Spikes means it is barely threatened by most hazards while threatening to sweep. Excadrill's power level has been falling off gradually due to power creep; however, Sand teams still appreciate its blend of high threat level and hazard removal.
