the rainbow dragons for gold and gem dragons for gems
The Gemstone Dragon is the best dragon because it gives gems instead of coins.
The Panlong dragon is the best, because it produces lots of money, and it is easier to get than a Sun, Moon, or Rainbow.
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.
The bone dragon is the best dragon to race in the Boneyard Chaldea.
There is no such thing as a Birthstone Dragon on DragonVale
The sakura dragon is best dragon to use for Cherry Road.
The clover dragon works best in the Ulstery Meadows race.
As of July 2012, there has not been a star dragon in DragonVale.
You don't breed a Kairos Dragon in DragonVale. You have to get parts to complete it.
To date, there is no grass dragon in DragonVale. You may be thinking of the plant dragon. See the related question.
The incubation time for a rainbow dragon in DragonVale is 48 hours.
Brass Dragon and Fire Dragon
Sonic Dragon and Flower Dragon
love dragon and panlong dragon