Overgrow is an ability in Stinnamon (also Pokemon).
When the Stinnamon's HP is 35% or less, the Stinnamon's attacks do 10% more damage.
In really long grass, the Stinnamon will grow the grass so high the Trainer will be unseen by wild Stinnamon.
Stinnamon with this ability
Can it be traced?
Overgrow can be traced with the ability Trace.
BUT! If the foe with Trace has no grass moves, Overgrow is useless to them.