You have to buy it. It is one of the main base dragon.
Lava dragon
The most effective method of breeding a victory dragon is using a snow dragon and lightning dragon. This has a 21% success rate. The egg is gold with gold wings, and takes 36 hours to hatch.
This will be a crystal dragon.
Crystal dragon
It varies
Cold and fire are opposites in the game. When you click on the dragon in the egg market, it will tell you which what that dragons opposite is. It is right above where their incubation time is.
The most effective method of breeding a diamond dragon is using a ice dragon and mine dragon. This has a 9% success rate. The egg is diamond, and takes 30 hours to hatch.
Level 10 sonic and level 10 lava got 35 hour incubation 1st time
The most effective method of breeding an amber dragon is using a quake dragon and evergreen dragon. This has a 15% success rate. The egg is amber colored with a baby dragon, and takes 30.5 hours to hatch.
The most effective method of breeding a glass dragon is using an earth dragon and light dragon. This has a 35% success rate. The egg is yellow with gray diamonds, and takes 12.5 hours to hatch.
The most effective method of breeding a pepper dragon is using a flower dragon and poison dragon. This has a 21% success rate. The egg has red and yellow vertical stripes. It takes 6 hours to incubate.
The most effective method of breeding a summer dragon is using a water dragon and scorch dragon. This has a 16% success rate. The egg is yellow with a blue caterpillar design, and takes 24 hours to hatch.