Vanillite

Vanillite is the only Ice-type Pokemon with access to Autotomize, which doubles its Speed and, along with its decent Special Attack, allows it to function as a late-game sweeper. It has also access to Ice Shard, which can be helpful to hit faster threats even when unboosted. Vanillite has poor bulk, though, which makes it vulnerable to priority moves after using Autotomize and to powerful attacks when unboosted. It also has a limited special movepool, being outclassed by Amaura in terms of coverage and power; however, unlike Amaura, Vanillite isn't OHKOed by Fighting-type priority moves. Its two abilities are useless: Ice Body doesn't give Vanillite any special advantage, while Weak Armor even is detrimental because it makes Vanillite weaker to priority moves.