Luxio is a feline, quadrupedal Pokémon resembling a young lynx or lion. Blue and black fur covers most of its body. Its ears, face, hind paws, and front half of its body are blue, while its hindquarters are black. Additionally, Luxio has a tufty black mane surrounding its face. The mane is longer on the male Luxio, while the fur on the hind paws extends to the ankles on the female. The insides of its rounded ears are yellow, as are its eyes. There are two yellow rings around each front leg and a yellow, four-point star on the tip of its tail.
Luxio is able to communicate with others of its kind using electrical pulses from its claws. Luxio lives in small groups and is able to generate powerful electricity by gathering the group's tails together. When facing an opponent, Luxio extends its claws in preparation. The claws can unleash 1,000,000 volts of electricity. Luxio takes great pride in its electric claws. Luxio are known to be kind enough to share the spoils from a hunt to its own kind.
Luxio debuted in The Rise of Darkrai, where it was among the Pokémon residing in a garden in Alamos Town. Luxio seemed to be shy, as it hesitated before it ran to Ash and his friends' Pokémon. It later participated in a near-skirmish between two groups of Pokémon, caused by a misunderstanding. Afterwards, it was a bystander during the battle between Dialga and Palkia.
Luxio made its main series debut in Leading a Stray!, where it helped a Wailmer that was trapped in the sewers. As a result, the Wailmer made it back into the ocean safely and evolved into a Wailord before rejoining its pod.
Platinum was attacked by a pack of wildShinx and Luxio in Extreme Luxio. One of them, due to his broken claws, was unable to communicate with his group and was shunned by them. In an attempt to regain his group's favor, he battled with Diamond's Pokémon. Pearl eventually managed to get his comrades' trust and befriended the Luxio. Later, he evolved into a Luxray and joined Pearl's team after being named Rayler.
Luxio is the only Pokémon with a base stat total of 363.
The official Japanese Pokémon website (Pokemon.co.jp) has a picture of Luxio on its HTTP 404 error page. This may allude to Luxio's National Pokédex number, 404.
Luxio seems to be based on an adolescent male lion or a lynx. It may have also been inspired by the mythical sphinx, as its short face, human-like ears, and lion-like appearance are similar. It may have also been inspired by the constellation Leo, due to Luxio's lion-like appearance and the fact that it bears a signature star shape on the end of its tail.
Luxio may be a combination of lux (Latin for light), lynx, and lion or leo (Latin for lion). Incidentally, the Karnak temple complex in Luxor, Egypt has a famous avenue of sphinxes.