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Fire+Earth dragon. if it's flaming rock dragon, try Earth+Fire goodluck :)
We can not get a Poo Dragon by breeding water and dark in dargon city because of it rare hybrid, so try breeding blizzard and dark, water and venom, vampire or mud. It might take a few tries or alot of tries to get it. If you do not get it do not get dishearted try a few more times and try to make your own combinations with the dragon of that hybrid. You might also get a Pirate Dragon.
2days
To breed a crystal dragon.. You must breed a Coolfire dragon + a Soccer dragon. The levels of your dragons do not matter. Remember that this is a pretty rare dragon you're breeding so it may take you several tries to get him [took me 4 tries] Dont give up it may take a while. Btw, you will know if you're getting a crystal dragon or not by looking on how long it will take to finish breeding at your breeding mountain or your ultra breeding tree, (should say 1 day and 23 hours and 59 min) If you want the other dragons (legendary,mirror,wind) you can try breeding coolfire dragon with gummy dragon or coolfire with armadillo dragon Good luck :}
8 hours long does the gummy dragon takes to hatch on dragon city.
9/MIN
1 day 7 hours
Breed an ice dragon and a firebird dragon, it might take a few tries but you will get it eventually
A century dragon takes 10 hours to breed, or 8 hours if using the epic breeding island.
It takes 12 hours for them to breed.
it takes 10-12 hours
Take on the dragon user's challenge in Dragon's Den.