From Bulbapedia, the community-driven Pokémon encyclopedia.
Shadow Sky (Japanese: ダークウェザー Dark Weather) is one of several Shadow moves available only in Pokémon XD: Gale of Darkness. Like other Shadow moves, it is forgotten and replaced with another move once the Pokémon is purified.
Weather effect of Shadow Sky
Shadow Sky covers the field in a shadowy aura that lasts for five turns.
While in effect it damages all non-Shadow Pokémon at the end of each turn by 1/16 of their maximum HP, boosts the power of Shadow moves by 50%, and changes Weather Ball to become typeless and double its power.
||Darkness hurts all but Shadow Pokémon for 5 turns.
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