Hallow: not rolled in the wild or from eggs.
Haunter (Hallow) is not found in the wild. Catch Gastly in Old Graveyard, then raise it to level 25 for Haunter.
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Speed at level 100: slowest with 0 IV, 0 EVs and a −Speed nature; fastest with 31 IV, 252 EVs and a +Speed nature.