It's legal I checked serebii before breeding it http://www.serebii.net/games/geniiiball.shtml
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Asada Shino San
Nelson Tangela
Duskull in Dream Ball is legal. HA Duskull in Dream Ball isn't. Trust me. The only way to get a Duskull in a Dream Ball was in Gen V. Duskull didn't get a Hidden Ability until Gen VI. There is no way...