For use in Rain only
BloodyHentai (Ferrothorn) (M) @ Life Orb

Trait: Iron Barbs
EVs: 136 HP / 252 SAtk / 120 SDef
Modest Nature (+SAtk, -Atk)
- Thunder
- Hidden Power [Water]
- Grass Knot
- Leech Seed
Thunder is 100% Rain acc, and gives him Para-support.
HP Water gets that Rain boost, we have to face that fact that even with Life orb helping out your damage, he needs the highest power coverage he can get :/
Grass Knot comes in for STAB, where he can play strategy. Where a specially Bulky Swampert could actually take an Energy Ball from this thing, Grass Knot should give it more of a challenge."
Grass Knot is there for it's potential to give out more damage to heavier foes.
Leech Seed lets you not worry about Life Orb damage, and is taking a portion of your opponents Hp, what's not to be happy with here? While I don't really reccomend ever using this thing period.
It's still always an interesting case, and can pull a big surprise. PS: Sorry for using Leech Seed :P