I would recommend sending an in game message stating your problem, and including your smash name. Menu -> extras -> help -> new ticket
I don't know which legendary dragons you have, but the 3 legendary dragons that exist are Captain Sparkles (grasslands), Wrot (badlands) and Rekker & Bob (swamp). You can buy the ones you don't have for real world money. Biomes are grasslands, badlands and swamp.