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(this is an example, but still rate it)
Jumpluff@ leftovers
-substitute
-leech seed
-sleep powder
-bounce
Chlolphyll
Jolly nature, 252 HP, 252 speed, 4 defense.
This is my jumpluff set. He is a subseeder which is standard and sleep powder increase the stereotype. However jumpluff is very fast And can pull it off effectively. Bounce is the trump card though. It does three things;
1) stalls for leftovers and leech seed
2)preserves substitutes while in the air
3) hits grass types which can be seeded for super effective STAB damage.

(this is an example,bit it os real, make your format somewhat similar to this)

A ferrothorn could beat this with leech seed iron barbs rocky helmet and gyro ball

It would be used UU and the only love that woud matter would be gyro ball. However I see the thron walls this thing cold. Ferroseeds however doesn't attack so I could bounce It to death. Grass types are not hit by leech seed so the feroothorn would probably end up losing or it would be an endless. Stall war where nobody could hit eachother