Cresselia has a blue, swan-like body with a yellow underside. It has pink eyes, a dark pink, round tuft on its head, and a pointed, beak-like snout. There are yellow, crescent-shaped ornaments on the sides of its head. Cresselia has glowing, pink, ring-like wings on its sides and back with paw like protrusions resting on its chest. These wings release shining particles and undulate beautifully around the quarter moon. Cresselia has the power to dispel nightmares, and holding one of its feathers is said to bring happy dreams. However, as seen in the anime, it can be quite hostile towards its counterpart, Darkrai. Cresselia is the only known Pokémon able to learn Lunar Dance. Cresselia is a female-only species.
Cresselia made its main series debut in Sleepless In Pre-Battle!. Cresselia normally returns to her shrine on Fullmoon Island during a certain time of the year when a Darkrai also comes by to cause nightmares. She may also leave her feathers, which people find to help stop the nightmares caused by Darkrai. In the episode, Cresselia helped Ash and the residents of Canalave City get better sleep by stopping Darkrai. Team Rocket attempted to catch Cresselia, but they were stopped when Dawn's Swinub evolved into Piloswine.
Cresselia appears on the Spear Pillar stage as one of three Pokémon who appear in the center (the others being Dialga and Palkia). Cresselia acts completely different than the other two in terms of attacks it uses. It will often use Psycho Cuts around the field, and sometimes shoot one large Psycho Cut as if it were a boomerang, hitting anyone that touches it.
A Lunar Pokémon. Cresselia appears on Fullmoon Island and, once discovered, flies around different areas of Sinnoh. Its signature move, Lunar Dance, causes Cresselia to faint but recovers all the HP and cures the status conditions of the next Pokémon its Trainer sends out. Cresselia excels at recovery techniques and is unusual in that it appears only in female form.
Cresselia's form seems to be based on a swan. Considering its crescent moon motif and the aurora-colored planetary rings around its body, it may originate from the constellation Cygnus. Cresselia shares characteristics with Sarimanok, a legendary fowl with a profusely decorated head, feathered tail, and colorful wings that is said to be a symbol of good fortune.
Cresselia may be a combination of crescent (referring to the lunar phase) and Selene (Greek goddess of the Moon).
In other languages
From crescent (referring to a phase of the moon) and Selene (Greek goddess of the Moon)