Originally Posted by Riolu
Do late game dragons have to be level 99 for the ultimate evolution? I already have all the materials to evolve him.
No, you can do it at lvl 1, it's the same for all the monster with ultimate evolution.
To do Ultimate Evolution, you'd enter the "Power-Up Fusion" tab instead of the "Evolve Fusion" tab. Put in the materials, and then the game will ask you if you just want to use them for exp, or evolving to ultimate stage (you still get exp no matter what you choose though).