FusionDex

Rarely, Chartales fusions result in the Pokémon having just a single burning tail. Tests by Pokémon researchers have determined that they have a more intense inner flame than other Chartales, but cannot cover as large an area with their fire.

It has long been said that each of the nine tails embody an enchanted power. The flame that burns at the tip of its tail is an indication of its emotions.