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

Every time a Pokémon with this ability levels up, if there is a spare slot in the player's party, a female egg of its basic stage will appear.