Blastoise & Hitmontop are the 2 premium rapid spinners in UU
Hitmontop @ Leftovers
Trait: Intimidate
EVs:252 HP / 252 Def / 4 Spe
Impish Nature
~ Rapid Spin
~ Foresight / Toxic
~ Sucker Punch / Stone Edge
~ Close Combat
Rapid spin, with good offensive prescence too - also has the ability to stop Spinblockers with Foresight
Blastoise @ Leftovers
Trait: Rain Dish
EVs:252 HP / 252 Def / 4 SpD
Bold Nature
~ Rapid Spin
~ Scald
~ Roar / Dragon Tail
~ Foresight / Toxic
Just a general wall/spinner. Scald for STAB/nifty burn chance, roar/dragon tail to phase, foresight also to get past spinblockers
Other Spinners include;
Claydol @ Leftovers
Trait: Levitate
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
~ Rapid Spin
~ Stealth Rock
~ Earthquake
~ Ice Beam / Toxic
Sits there, does some spinning, setting up of it's own, some damage then dies XD
Kabutops @ Life Orb
Trait: Weak Armour
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
~ Rapid Spin
~ Stone Edge
~ Aqua Jet
~ Swords Dance / Waterfall
Its like a physical starmie in UU! After Rapid Spin can go on the offense/set up with Swords Dance and priority Aqua Jet + STAB Stone Edge
Sandslash, Wartortle (with eviolite), Torkoal and Armaldo are also options to run