Skeleton is breedable now as the Dragon of the Month for October 2015!
How to Breed Skeleton?
To breed Skeleton use a combination of Plant, Wind, Water, and Metal. Keep your combos to using just those elements if you want the best chances, use the How to Breed Skeleton page to find the very best combos to use. Then keep trying and hope you get lucky because even the best combos are very low odds.