Best Grass Type Pokemon?

FERROTHORN! im in love with this guy and im using him currently in my black 2 team and it hasn't let me down yet, by god its an awesome pokemon.
Ferrothorn has EPIC defence stats and will soak up even the most powerful of moves all day and every day, also it learns some pretty handy movies which complement this pokemon more than a middle eastern man does a corner shop. like the moves iron defence and gyro ball and payback, iron defence to make Ferrothorn impossible to kill, gyro ball -the slower the user the more powerful this move, believe me its a slow one, and payback -Its power doubles to 100 if the user moves after the target. But dont be fooled by ferrothorns sluggish and defensive natures boy can the guy deal some damage, the physical attack stats are tipping towards the top of the chart so dont take ferrothorn as a joke especially when this pokemon has the ability iron barbs which can take out pokemon without even attacking them.(inflicts big damage on pokemon that touch/attack ferrothorn)
Ferrothorn also is a secondary type steel which is pretty handy when it comes to taking on those pesky flying types! and the steel type also open up a whole new move pool, full of powerful steel attacking and special defence moves.
My Poke Rating? gotta be a 8-9 out of 10.
Good Move Set for ferrothorn:
Item-Leftovers
Ability-Iron barbs 
Iron Defence
Ingrain/curse
payback/use gyro ball if you have curse
Power Whip
And a nature that lowers speed and raises defence or physical attack would be nice!
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