Luxray was caught during the two years between Best Wishes: Noble Victories and Best Wishes II. Not much is known about where or when he was caught other than he was caught as a Shinx before evolving into Luxio and evolved once more into Luxray.
Luxray is an intimidating yet loyal and kind Pokémon. It appears to be distant and cold towards strangers and Pokémon it doesn't know, in order to be protective towards Lexi. However, to those it does know it's kind and warm, always making sure that they are happy or comfortable. In battle, Luxray is a fierce opponent who has so far never lost.
When his eyes gleam gold, Luxray has the ability to see through objects, which helps scouting for danger.