All-out Attacker / Anti-Hazard Support
Espeon @ Focus Sash
Ability: Magic Bounce
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Psyshock
- Grass Knot
- Shadow Ball
- Baton Pass / Hidden Power [Fire]
This is a fairly simple Espeon designed to take on most of the various hazard setters in the tier, while also providing offensive support with her excellent speed tier and 358 SpAt.
Basically, with Focus Sash and this set, Espeon can beat the vast majority of hazard setters in UU one on one.
Psyshock is your general go-to attack, and it 3HKOs Blissey even without an item to boost its strength. Blissey will be forced to Soft-boiled, giving you a free switch to something that threatens her out. It's also a guaranteed 2HKO even on 248/240+ Nidoqueen, OHKOs 252/0 Roserade with plenty to spare, easily stops Infernape and has a 99.6% chance to 2HKO Mega-Aerodactyl (although if you don't catch Aero on the switch, Aero will outspeed and 2HKO you first... play carefully!).
Grass Knot deals fantastic damage to bulky grounds and waters, OHKOing and 2HKOing Swampert, Krookodile, Hippowdon, Donphan and Rhyperior. It also has a pretty good chance of 2HKOing non-hazard bulky waters like Suicune (guaranteed if rocks are down) and Mega-Blastoise (54% minimum on 236/0 MegaBlast).
Shadow Ball is for Azelf, Celebi, Jirachi, Metagross, Froslass and Bronzong. (Be careful, though - specially defensive variants of Celebi and Jirachi are only 3HKO'd by it.)
The last slot can either go to HP Fire, which OHKOs standard Forretress (if Sturdy is broken) and which 3HKOs 248/120 Mega-Aggron, or it can go to BP to escape Pursuit traps and pivot out to something that chases off those two. I personally prefer BP, especially combined with a Pursuit trapper of my own to handle the specially defensive variants of Celebi and Jirachi. However, if you'd prefer Espy to be more self-sufficient, there's certainly nothing wrong with using HP Fire. Just beware - HP Fire means you lose the Speed tie with Froslass.
Regarding team support, this Espeon is best as the supporting player on HO, keeping hazards off the field without killing momentum or offensive pressure. Hydreigon is your single biggest threat, so make sure you have something that can switch in to it. Empoleon is also the hazard setter most likely to beat you one on one, so something that scares away Empoleon is appreciated.