Set: Bulky Froslass

Froslass @ Leftovers 

Trait: Snow Cloak 

EVs: 224 HP / 108 Def / 176 Spd 

Timid Nature (+Spd, -Atk) 

- Taunt 

- Spikes 

- Pain Split 

- Ice Beam

This Froslass has been one of my favorite UU sets in this generation and the previous one. Although Froslass initially seems pretty frail, it can actually run an effective bulky set that manages to simultaneously cover the roles of spiker and spin blocker.

These EVs bolster Froslass' physical defense while ensuring it outspeed Base 100s like Flygon. Taunt shuts down slower opponents and can be used to set up on threats like Chansey. Spikes are of course obligatory on this set, and Froslass functions as one of the best Spikers in UU. Pain Split gives Froslass a decent recovery move that allows it to heal up and damage opponents. Finally, Ice Beam allows Froslass to hit opponents with a solid STAB move. This is particularly useful for checking weakened threats like Donphan and Zapdos.

Bulky Froslass is a great example of a Pokémon with dual roles. By stacking hazards and blocking spinners, Froslass integrates two jobs into one set, making team building very efficient. This strategy gives teammates more flexibility and allows them to run a greater variety of sets.