I don't really like that set, and I'm sure other don't. Sure, it's cool to get +2 in one turn and everything, but Water-types still rape it. I guess it's underrated as it can wreck havoc with proper team support, but most of the time it's just not good...It's not worth the trouble of setting up hazards, removing Water-types, getting rid of all your opponent's phazers, taunters, etc....
E: Ok I have something. This is Belly Drum Poliwag. I saw it in a LC analysis today and started using it--holy fuck this thing is amazing. Pretty much switch in on something stupid like Bronzor or Tesshiido, Encore while they SR/Protect or whatever, then Belly Drum on the switch. Oran Berry will activate, and since you're at 10 HP, Oran Berry will activate and bring you back up to max (20). Did you know Poliwag has base 90 Speed? I didn't. Seriously, this thing is as fast as Lucario. Now what? Well, you have a full health 56 Attack 19 Speed monster to rape with. You can use an alternate spread of 116 HP / 196 Atk / 196 Spe, but then Oran Berry won't fully heal you. Here is the set:
[box]Poliwag (M) @ Oran Berry
Trait: Water Absorb
EVs: 196 Atk / 36 Def / 36 SDef / 196 Spd
Jolly Nature (+Spd, -SAtk)
- Encore
- Waterfall
- Return
- Belly Drum[/box]
PS this thing resists Bullet Punch and gets healed by Aqua Jet, funsies everywhere.