how do you get those dragons and I'm new to this game but I'm trying best own but I need help getting these dragon so can someone please help me

Metal dragon you can buy in the shop for gold. Double Flame and Ice are only available for sale, and only when they are on promotional sale. Hot Metal is breedable using dragons with his elements. There are combos in the breeding post of those that are breedable, please review them. You can also look at dragoncityguideDOTnet for good breeding combos. Any dragons not in those areas are sale or event only dragons, and are not breedable.

@Nynaevelan thank you for your help