I'm guessing this is in-game, meaning your items are limited.
Espeon @ Light Clay/ Twisted Spoon
Ability: Magic Bounce (is best)
- Reflect
- Psychic
- Shadow Ball
- Calm Mind/ Morning Sun
Light Clay to help prolong Reflect's duration, or Twisted Spoon to boost Psychic's power. When training, Smoke Ball will be extremely useful.
Skarmory @ Rocky Helmet
Ability: Sturdy
- Spikes/ Roost
- Stealth Rock
- Aerial Ace
- Steel Wing
Not much to say... Skarmory has a pretty shallow offensive movepool..
Jellicent @ Leftovers
Ability: Water Absorb
- Recover
- Will-O-Wisp
- Shadow Ball
- Surf
Surf is much a better move. Higher PP, an HM move, and damage is not dependent on your HP.