Plusle
Plus
If allied with a Pokémon with Minus, its Special Attack increases 50%.
Type Tier
Electric UU
Statistics
Min- Min Max Max+
HP
60
 - 261 324 -
Atk
50
 122 136 199 218
Def
40
 104 116 179 196
SpA
85
 185 206 269 295
SpD
75
 167 186 249 273
Spe
95
 203 226 289 317
Name Item Nature

Baton Passer

 Leftovers Timid
Moveset EVs
~ Baton Pass
~ Sing
~ Thunderbolt
~ Agility / Nasty Plot / Substitute
252 SpA / 6 SpD / 252 Spe

As bad as Sing is, it's pretty much a requirement here. Your main hope is to Sing the opponent's counter or pseudohazer, set up, and then Baton Pass.

Name Item Nature

Sweeper

 Life Orb Timid
Moveset EVs
~ Hidden Power Ice
~ Grass Knot
~ Thunderbolt
~ Nasty Plot
252 SpA / 6 SpD / 252 Spe

Use this ONLY in NU—it will get slaughtered in UU.

Other Options

Thunder Wave for Paralyzing certain UU tanks, like Hypno.

EVs

Plusle needs to maximize its Speed to be able to pass its Nasty Plots quickly. Max out its Special Attack as well.

Opinion

Plusle and Minun are the best Nasty Plot passers in UU, so uh... yeah.

Counters

Any sort of physical attack will do lots of damage. Earthquake will be a slaughter. Special attacks will also do good damage, though maybe not enough to stop it before it uses Baton Pass. If you want specific counters: Whiscash, Quagsire, Gastrodon (without HP Grass); Grass types (without HP Ice), Camerupt, Steelix, Hypno, and Grumpig can all take Plusle's hits adequately. Optionally, just outspeed it and kill it, which should be easy for most Choice Scarf users.