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Toxic Waste
Description: Noxious waste that wreaks a foul odor. It is damaging to touch or ingest.
Effect: If a Pokemon uses a draining move or an item switching/stealing move, they instead lose HP in relation to their weakness to the Poison Type. Also, any recovery or item swapping effects are canceled.
(This includes Pluck, Thief, Switcheroo, and Trick.) (If the holder is not Poison-Type, they lose damage in relation to their weakness to the Poison Type every turn.
Fling power: 80
Buy: 5000
Sell: 1000

I would vote positive but why is the sell so much different from the buy?

Lol .

Pokemart makes money by ripping off 10 year old kids

Negative just do Black Sludge/Poison Barb for evolving, lots of things boost poison moves already (Plate, another Item that I don't know name of)

Honestly Positive because it isnt too bad for Pokemon, and not too good...