you must either get lucky or time in Fortunas chance or pay for rubies to buy it otherwise cheating if u can find a site that actually works would be the only way unless it is a reward for a challenge which i don't think there is one.
They appear randomly
No you can't
More then likely the dragon wouldnt appear every Easter, since the dragon was a prize for collecting a certain amount of eggs. But more then likely this dragon will appear in the future
There's a drake (small dragon) in devilfire grove on the way to the Shadow Fort, more appear after you kill the Dragon and in New Game +
Yes, they did appear together in Way of the Dragon aka The Return of the Dragon. Bruce kills Chuck in the Roman Coliseum.
The Androids Appear
the buu saga
Dragon Ball Z - 1989 The Androids Appear 4-10 was released on: USA: 14 September 2000
The original was in the movie "The Last Dragon"
Some cartoons that included a dragon character include "Puff the Magic Dragon", "Dragon Ball", "Legendz" and "Pocket Dragon Adventures". Dragons often appear as one time characters in many other cartoons.
It could only appear once since its so rare but it could appear more than once
Around episode 200