Below is an extract from the games files
it shows all the Breedable Legendary dragons that also have a status of breedable.
This page updates automatically when the game files update
King Dragon
Wizard Dragon
Ninja Dragon
Ice&fire Dragon
Summerfly Dragon
Pharaoh Dragon
Dujur Dragon
Brontosaurus Dragon
Gargoyle Dragon
Deep Red Dragon
Azure Dragon
Glacial Dragon
Burning Dragon
Bone Dragon
Wyvern Dragon
Hades Dragon
Atlas Dragon
Leviathan Dragon
Moon Dragon
Toxic Dragon
Meteor Dragon
Tribal Dragon
Aquamarine Dragon
Troglodyte Dragon
Master Dragon
Greenfluid Dragon
Sylvan Dragon
Animation Dragon
Dark Elf Dragon
Steam Dragon
Howl Dragon
Magnet Dragon
Quake Dragon
Apocalypse Dragon
Millennium Dragon
Forge Dragon
Promethium Dragon
Abyss Dragon
Mirage Dragon
Supersonic Dragon
Core Dragon
Basilisk Dragon
Space Dragon
Acoustic Dragon
Unity Dragon
Anniversary Dragon
Da Vinci Dragon
Amber Dragon
Secret Fire Dragon
The Amazing Dragon
Prophet Dragon
Flawless Dragon
Balloon Dragon
Dreamcatcher Dragon
Bride Dragon
Gurgle Dragon
Naughty Dragon
Underworld Dragon
Red Rose Dragon
Mermaid Dragon
Illusion Dragon
Chakra Dragon
Spring Dragon
Graduation Dragon
Anubis Dragon
Soul Eater Dragon
Retired Dragon
Dejavu Dragon
Never Grow Dragon
Old General Dragon
Sustainable Dragon
Third Birthday Dragon
Joke Dragon
Intraterrestrial Dragon
Glowppy Dragon
Archer Dragon
Free Spirit Dragon
Dracula Dragon
Disco Ninja Dragon
Millennial Dragon
Pyrex Dragon
Wilderbeast Dragon
Tailwind Dragon
Augmented Dragon
Rook Dragon
Kernel Dragon
Piston Dragon
Neumon Dragon
Neo-izumi Dragon
Neo-kira Dragon
Neko Dragon
Moon Rock Dragon
Moon Walk Dragon
Forgotten Dragon
Cake Dragon
Dimensional Dragon
Grove Dragon
Dark Star Dragon
Millium Dragon
Decay Dragon
Spaceship Dragon
Love Potion Dragon
Stardust Dragon
Ufo Dragon
Black Metal Dragon
Psychedelia Dragon
Elven Dragon
Pyramid Dragon
Chichen Itza Dragon
Gift Dragon
Tri-feather Dragon
Parade Dragon
Daisy Dragon
Pyre Magus Dragon
Perseverance Pearl Dragon
Dreamgaze Emerald Dragon
Illustrious Ruby Dragon
Burning Sands Dragon
Spectacle Dragon
Aegis Dragon
Pyroclastic Dragon
Nile God Dragon
Croconile Dragon
Quasar Dragon
Predator X Dragon
Crustocean Dragon
Festive Lights Dragon
Lamp Genie Dragon
Caroling Dragon
Blue Dragon
Scarlett Dragon
Projectile Dragon
Shapeshifter Dragon
Dragon Clone I Dragon
Dragon Clone Ii Dragon
Morpheus Dragon
Animowl Dragon
There are 3 methods that will work for breeding legendary dragons, The first (most common) tactic is to breed a Pure Dragon with a War Dragon.
This has a 40% chance of breeding the Kratus Dragon who knows both Pure and War type moves.
Because the breed rate is so high, it is reccomended to do this reptitively and recall the duplicate Kratus dragons using the tree of life.
The next option is to try and breed one of the many legendary dragons that have a single element of Legend.
This can be done by breeding 2 Pure dragons together, and is estimated to have a 1% success rate.
It can take a long time, and one of the only ways to get the "Legacy Dragon" which is needed for a perticular quest later in the game.
The other way is to upgrade your breeding santuary, which unlocks new breeding possibilities but only when breeding on the sanctuary itself.
There are a number of legendary dragons available from later stages of the breeding sanctuary