"Absol has the ability to foretell the coming of natural disasters, and every time Absol appears before people, it is followed by a disaster such as an earthquake or a tidal wave. As a result, it came to be known as the disaster Pokémon. It lives in a harsh, rugged mountain environment and very rarely ventures down from the mountains."
Absol first appeared as the group were on their way to Lilycove City, on Route 120. They encountered the Absol, which is very rarely seen other than when Disaster is near. Believing Absol to be a Pokémon that brings Disaster, everyone tried to scare it away by battling against it, however, it refused to leave. Despite trying to run away from it, the Absol continued to follow the group. Lexi, not believing it meant any harm, decided to capture the Absol in Disaster Strikes?!, feeling that it could be trying to warn her of a future disaster.
Absol never really battled on Lexi's team, other than when against Team Aqua. He predicted the looming threat of Team Magma when Archie's plans with Kyogre were still in process. After dealing with Kyogre, Groudon, Rayquaza and Deoxys, Lexi was going to release Absol, however he showed desire to remain with her and began battling competitively.
Absol are a usually distant and intimidating Pokémon, which is rarely seen to be sociable or happy. Because of it's ability to detect natural disaster, it's often cautious and rarely shown to be happy or excited. Despite this, Lexi's Absol has shown several moments of genuine happiness being with Lexi and playing with her Pokémon.
Absol is able to foretell disaster and imending doom through his horn.