Eevee

Team Benefit

Eevee's Curse set has serious competition with Bidoof in UU, but has its own strongpoints. First off, it has higher initial defenses than Bidoof, aiding it in setting-up Substitute. It also has higher Speed, allowing it to outspeed foes such as neutral-natured, 0 Speed Lombre, Mantyke, Prinplup and Pupitar, all of whom Eevee outspeeds, and Bidoof doesn't. If your team needs the extra Speed to be able to do damage to these foes, and don't want to rely on Bidoof's Quick Attack, Eevee may make a better teammate. However, Bidoof's selling point is its superior ability, Simple. Because of Eevee's higher defenses, it can take the first hit from the foe better than Bidoof can before Eevee uses its own Curse, but after the turn Curse is used, Bidoof has higher defenses and Attack power. This means that you should decide between these two on the basis of synergy, and how easily your team can introduce them to allow them to set-up their initial Curse attack.

Eevee tends to draw Pokemon such as Drifloon, Gastly and Duskull, who take little damage from most of its attacks, so having a Ghost-type of one's own is wise. Having a Ghost-type also gives Eevee much-needed synergy for Fighting attacks aimed at it, and allows Eevee a free switch-in if the ally is attacked by a Ghost-attack. The same Pokemon who work well against Eevee (Duskull, Drifloon and Gastly) also work well with it because of this.

Counters

Duskull is immune to Normal and Ground attacks, only fearing a non-STAB Iron Tail, which with Duskull's Defense, usually does not result in serious damage. It can then proceed to use Will-O-Wisp to damage Eevee's attacking potential. Gastly takes more damage from Iron Tail, but can do more effective damage to Eevee through Dark Pulse or Thunderbolt. Combusken outspeeds Eevee, and can attack with Brick Break for serious damage. Aron only fears Dig, and can take advantage of the move by using Earthquake, doubling its power, and doing serious damage to Eevee. In OU, Grotle is hardly scathed from anything other than Last Resort and a boosted Flail, and can attack with STAB Grass attacks, while bulkier versions of Grotle can Rest away damage.

In OU, Machoke is arguably Eevee's best counter. Bulkier sets don't fear most of Eevee's attacks, and Dynamicpunch takes down nearly any Eevee in the game. Gligar is immune to Dig, and has enough Defense to take most of Eevee's attacks while it uses Swords Dance to set-up, and proceed to outspeed Eevee and attack with a STAB Earthquake. Bronzor is resistant to all of Eevee's most common attacks, and can set-up entry hazards or screens on Eevee to allow another Pokemon to counter it. Sneasel only fears switching into Iron Tail, and can KO Eevee with Brick Break.