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Triple Battles time! The following is 100% theory; I pretty much made this up just now. Feel free to let me know how it goes.
Smeargle. Moody. Focus Sash.
Dark Void, Simple Beam, Skill Swap.
Clefable. Cute Charm. Mental Herb.
Minimize, Cosmic Power, Follow Me, and Protect.
Lopunny. Cute Charm. Choice Scarf.
After You. (It's the fastest user of it.)
Xatu. Magic Bounce.
Skill Swap.
Start with Lopunny AYing Smeargle, who uses Dark Void, sleeping most opponents before they can even do anything. Meanwhile, Clefable uses its first Minimize.
Then, Lopunny uses AY again on Smeargle, who in turn uses Simple Beam on Clefable, who uses Minimize again.
At this point, your opponents might be waking up, but who cares? Use Skill Swap between your Smeargle and Clefable, so you now have a Moody Clefable with +6 Evasiveness.
Now, you start using Cosmic Power to get your defenses up. When Smeargle or Lopunny dies, bring in Xatu. Once Clefable's stats are boosted well enough, you should Skill Swap Magic Bounce onto it to prevent phazing.
Finally, use Follow Me. This will redirect all attacks to Clefable, and most of them will miss or deal negligible damage. This will allow you to wipe the floor with other, frailer 'mons, like Hawlucha. If you're REALLY lucky, try using a Magikarp.
Some other options:
> Heal Pulse and Bestow@Leppa Berry can keep Clefable healthy and supplied with PP.
> A Taunt user can protect Clefable from Haze.
> Psych Up.
> Wide Guard.
> Togekiss gets Psych Up, Follow Me, and Flinch hax.