Flame Dragon Combinations
Flame + Terra = Flaming Rock or Volcano
Flame + Sea = Cloud or Blizzard
Flame + Nature = Firebird or Spicy
Flame + Electric = Hot Metal or Laser
Flame + Metal = Medieval or Steampunk
Flame + Dark = Vampire or Dark Fire
Please note that breeding Flame and Ice to get Cool Fire Dragon is not possible here.
Since the Cool Fire Dragon cannot be bred directly from the generation 1 dragons of flame and ice, you will have to use a flame hybrid dragon to mate with the ice dragon.
For a quick way to breed one, use:
Alpine(Terra+Ice) + Medieval(Flame+Metal) = Cool Fire
You can also get Armadillo and Soccer as well, which is good.
Source: Gamesfreetop.com