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

Pokémon using this ability float, usually without being Flying-type, and so are unaffected by Ground-type moves.