Don't use a rocket to deal the final blow because the body will fly off the side of the map and you won't be able to get the element

It is a easy tame just bring a few narkobarys and a bow and you will have a pet dragon

You can have your own tamed dragon by using the commands, but for a short amount of time. This is a very cool glitch. You can ride and control the dragon but when you ask it to attack a creature it will not and just stay still. It stayed around for maybe 10 minutes then disappeared leaving no trace of it behind.

On the xbox just get a longneck and shocking trank darts and their you go