Note to all editors! All Diamond Pearl moves' contest info is subject to change! Please note the recent change to the Attack template!
PT Info Only or your ass is ours. ~The Staff -------- The plural of pokémon is still pokémon. -------- Don't fill out templates that aren't ready yet (TL, we're looking at you).
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From Wikidex

Pokémin with this ability prevent opponents from switching out by shadowy means.