Monotype: Steel- "The Premier Scarfer"
With an above average Base 109 Atk further buffed by it's Hustle Ability and a Speed Stat that allows it to outpace Terrakion by exactly 1 Point, the Iron Ant Pokemon can be considered to be the best Scarfer Mono Steel Teams have to offer.
Durant @ Choice Scarf
EVs: 252 Spd / 252 Atk / 4 HP
- Iron Head
- Rock Slide / Stone Edge
- Baton Pass
Perhaps one of the most underrated Pokemon in the Monotype Sub-Metagame, Durant's combination of Physical might, oddly high Speed, sufficient Coverage Moves, and Baton Pass make the Iron Ant Pokemon Mono Steel's "Primier Scarfer", outclassing it's Competition in Lucario in terms of Speed and Jirachi in terms of Power.
Given all the Coverage Move's it needs, it's STAB Attack in Iron Head synergizes well with the typical Paralysis-Based Mono Steel Teams, while Rock Slide eliminates the Fire Type that threaten it. In addition to that, BW2 also blessed it with yet another odd perk: Superpower, a Move that breaks down the Steels and Water/Ground Type that resist it's Steel/Rock Coverage. To top it off, it also follows the Generation V pattern of granting Bug Type's Baton Pass, so, like Scolipede, it also capable of using the pseudo-Pivot Move to Scout out the opponents next Move, functioning much like a U-turn or Volt Switch but with the absence of Damage or, being blocked by an Immunity.
The Jolly Natured (+Spd, -SAtk) gives it the Speed to outpace even Terrakion, killing it off with a 252 Atk+Hustle Iron Head. The Choice Scarf of course Boost it's Speed to beat other Scarfers that threaten Mono Steel (Terrakion).
Overall, Durant has proved to be the best Scarfer of Mono Steel due to the above advantages.