Darkrai first appeared in Gallant Fate series when Team Galactic ended up arriving in the region. Darkrai was released into the region after years of being inprisoned, causing it to be enraged and scared of its surroundings. As it was lead to the location of Lexi and her friends, the group attempted to stop the Pokémon from destroying the town. Despite putting up a good fight, Darkrai is contained momentarily, but Team Galactic's interruption results in Darkrai becoming enraged once more and uses Dark Void, which causes both Marlon and Calem to succomb to a deep sleep psychosis.
Shortly after this, Team Galactic manages to steal back Darkrai, and it, along with the Team return to Sinnoh.
It's later brought out to do the same again to Lexi with her in Sinnoh -this time, Lexi is successfully put to sleep. However, her body is recovered by Nessa before Team Galactic get to her, and while in a deep sleep, she is able to successfully discover the truth behind Darkrai's intentions (seeing that it has been tortured by Team Galactic. Darkrai is then able to awaken Lexi itself, shortly after revealing its whereabouts. Lexi manages to discover its location and frees it from its hiding spot in Canalave City, and befriends Lexi. From there on, Darkrai becomes her ally, and aids Lexi in taking down Team Galactic.