Well right, Gastrodon needs to be a Female, If you could actually grab a West and East sea version that'd be awesome, I'd prefer all IV's to be 31, Makes breeding alot easier, Also Modest natured c:
Muk...Muk will need all IV's to be 31 and Acid Armor as a move (Or if it's level 100, I can just re-teach it on Pokemon X later) Any nature otherwise.
Oh and for Muk to be Male, Since he'll be passing on the IV's and Acid Armor c: