They are immune to normal attacks and have no weaknesses against any of the element attacks. The normal moves are shown with a fist and carry normal effects against all dragon types except Legendary dragon class. i hope this helped alittle .
Sadly only legendary is the only choice to fight effectively against legendary. Your best choice if you don't have a legendary dragon is to hack away the best you can with your strongest base elements, earth, fire, and water. Don't use basic normal atracks as they are weakest hits.
pure dark dragon
seahorse mirror wind crystal
the arch angel dragon
wind dragon
legendary
Legendary dragon weakness is legend dragons
legendary dragon and dark
legendary and fire dragon
you can breed some legendary Pokemon with ditto but the rest you cant
legendary dragon and plant dragon and fire dragon
what can you get a legendary dragon will breed
legendary dragon+pure dragon
You may have legendary dragon. (mirror, wind, crystal and legendary dragon)
how to breed legendary dragon you have to breed cool fire dragon and gummy dragon
jakol ka
electric+metal=battery dragon