It was said by the ancients that the first Lumineon did not swim through the darkest depths of the ocean, but flew through the night sky on its butterfly wings. Those on the ground mistook it for a planet, for it shone as brightly as planets did, and its dark blue coloration prevented the rest of this pokemon from being seen. Yet with these comparisons, Lumineon grew arrogant, and sought to challenge the Moon for the prize of the brightest of the stars.
The Moon (usually portrayed as a Lunatone in this tale) did not fight for itself, because it feared its weakness to water, but sent forth Cresselia as its champion. Lumineon accepted the substitute, confident of its power, but was defeated by Cresselia's first attack. The attack stripped Lumineon of its power of flight, so it fell out of the sky into the ocean, then continued to plunge all the way to the sea floor.
Cresselia's attack had left Lumineon's wings as aerodynamic as an Empoleon's as a punishment for its hubris. But Lumineon did not mourn, for it had become the brightest light in the deep sea, with no sunlight, moonlight, or even starlight to compete with its shine. It laid eggs all around the oceans, which hatched into many children, and today its descendants light the way for divers and pokemon alike. Yet they are as jealous of this privilege as their legendary ancestor, and will frequently attack the artificial lights carried by scuba divers or fight to drive Lanturn up to the brighter parts of the ocean.