On the back of a Wailmer

Ferrothorn


Grass/Steel Tier: OU

Iron Barbs
If Ferrothorn is attacked by a Direct Attack, the attacker receives damage equal to 1/8 its maximum HP.

HP: 74
Attack: 94
Defense: 131
Special attack: 54
Special Defense: 111
Speed: 20

Overview
Heard the rumors that this generation is so offensive walls don't stand a chance? Ferrothorn hasn't. It has a unique typing that gives a ton of resists and only 2 weaknesses. Couple that with amazing overall defensive stats, and you've got an OU staple. Oh, did I mention it can use Spikes?

Wall
Ability:Iron Barbs
Moveset
Spikes
Leech Seed
Power Whip
Gyro Ball
Held Item: Leftovers
Nature: Relaxed +Defense -Speed
EVs: 252/0/56/0/200/0

Ferrothorn's walling capabilities are incredible. While Fighting and Fire moves are very common (Fighting moves in particular gaining popularity in 5th gen largely due to the new, very capable Fighting Pokemon), Ferrothorn walls almost anything not using such moves. Leech Seed and Iron Barbs damage stack very fast, and so do the Spike layers. Power Whip and Gyro Ball are there for when you cannot put more Spikes on the field.