Okay, listen up 'cause this is the lecture. First you will need a metal and lightning dragon in order to get an Apocalypse dragon. Since both metal and lightning dragons are elemental/base type dragons (as I like to call it) you have to either buy them or breed them using 2 of the same dragons. But if you plan to buy them, lightning dragons cost 75,000 coins and metal dragons costs 1,000,000 coins. It might take a long time to breed if you don't have the required amounts of coins ready (especially 1,000,000 coins -_-"). Anyways hope that helped~! ^_^
I got mine with a magnetic dragon and a lichen dragon and got it while trying to get another apocalypse dragon.
yes
You don't breed a Kairos Dragon in DragonVale. You have to get parts to complete it.
you breed a ice dragon with a mine dragon
You have to breed a plant and a fire dragon.
As of July 2012, there has not been a star dragon in DragonVale.
You have to breed a sun and moon dragon together
You have to breed a metal and a water dragon together.
You have to breed a plasma dragon with a salamander dragon.
Breed the earth dragon with the fire dragon.
To get a Smoke Dragon, breed a fire and air dragon together.
There is no "marsh" dragon in dragonvale but if you are referring to the moss dragon the best way to get it is earth and plant, although you also have a chance to breed the tree dragon.