Celestia and Luna together.
Together, PRINCESS CELESTIA and PRINCESS LUNA (in NIGHTMARE MOON form) are the official version mascots of Ponymon Dawn and Dusk. They are also two of the type archetypes of the game, representing Light type and Dark type Ponymon. Both Ponymon are super effective against the Chaos type.
Evolutions[]
CELESTIA evolves from Y Celestia.
LUNA evolves from YPrncsLuna, and has a second evolution to Ngtm Moon. This is probably through use of a NIGHTMARE STONE.
The title screens of Ponymon Dawn and Dusk, featuring CELESTIA and N MOON.