Seaking
Lightningrod (DW ability)
@Life Orb, Salac or Leftovers
200 HP/252 Atk/52 Spe Adamant or Jolly
Megahorn
Waterfall
Agility
Poison Jab / Endure
The basic idea is to use this pokemon on a rain team or on a team that really attracts electric moves. It's much, much stronger on DS wifi when your opponents can see your team lineup prior to fighting it.
You're mostly using it for the surprise factor, but because Seaking is now immune to electric attacks, it can setup against many low move pool threats like Jolteon or Magnezone.
If they switch in a grass type, you have both megahorn and poison jab to try to deal with it. Agility with 52 EV in speed is approximately all you need to outspeed anything, though obviously the speed in EV can be increased or decreased as you feel necessary.
Of course, it's outclassed by many other volt absorb switch ins, as even with a SPA boost Seaking has horrible SPA, but it's still something to consider if you're doing a rain politoed team, as most players should suspect swift swim on Seaking.
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This set has probably been posted, but I'm find it quite amusing:
Dodrio @Lum Berry or Leftovers
252 Spe/252 Attack/4 HP
Tangled Feet, Jolly
Sleep
Rest Talk
Thrash
Drill Peck / Acupressure
Tangled feet currently doesn't tell the opponent that Dodrio's evasiveness rose. Thrash, get confused, get cured by lum berry, thrash again or rest, and just get a little lucky. Dodrio's attack stat is great. Accupressure is kind of funny with this set, as you gradually become more bulky as you become more evasive, but you get the picture.
This set is even stronger in 2v2s with a Teeter Dancer on your team. Pidgeot can also run a similar build. Most of the time the opponent just switches in a thunder and Dodrio dies in one hit, so... just be careful with timing this set.
I've been trying a mixed Heatmor
Heatmor @Leftovers or Sitrus/Petaya/Salac Berry (depending on ability)
Flash Fire / Guttony
252 HP / 252 SpA / 4 Attack, Modest
Hone Claws
Inferno
Sucker Punch
Rest / Substitute
Where you switch in on a flash fire (or somehow setup with substall+gluttony), hone claws into a hopefully-hitting inferno, and surviving thanks to your target's burn status. If you survive the next hit, you might be able to kill it with a sucker punch. It's in the refining phase, but I just love the idea of possibly getting a few hone claws off and killing slower enemies with inferno and faster ones with sucker punch. At worst, you rest/substall with burn status on your opponent. I suppose you could go more bulky and forget about any stat in SPA if you're want to try relying more on that, but there are better willowisp users, the benefit to inferno is dealing good damage while also always incurring a burn.