Stealth Rock

From Pokemon - Wiki on Neoseeker

Stealth Rock is a fairly unique Rock Type move introduced in Generation IV.
It drops a layer of "Pointed Rocks" on the opponents side of the field causing all Pokemon who switch in to take damage.
It takes 12.5% of the opponent's max HP but is effected by weakness and resistance, and as a result can cause between 3.125% and 50% damage.

Super effective on both types = 50%
Super effective on one type, neutral on the other = 25%
Neutral on both types = 12.5%
Resisted by one type, neutral on the other = 6.25%
Resisted by both types = 3.125%

Although no Pokemon learn it naturally, many learn it via TM76.
It can be cleared by the moves Rapid Spin and Defog.

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