Well, breed a level 6-10 fire and magic dragon to get a planet
There is no way on dragon vale or dragon story
To create a purple dragon in Dragon Story: Fairy Tail, you will need to breed dragons with purple traits or colors. Try combining dragons with purple elements such as the Amethyst Dragon or the Twilight Dragon to increase the chances of getting a purple dragon offspring. Experiment with different combinations until you successfully breed a purple dragon.
Forest & Desert dragon should make an Armor dragon in Little Dragons.
you can't make metal dragons, you have to buy them
Ice dragon + alpine dragon
mud dragon+dark dragon
you can't make metal dragons, you have to buy them
gummy dragon and coolfire dragon
two legendary dragons
wind dragon and legendary dragon
dandelion dragon and laser dragon
legendary dragon