He battles with one Pokémon, the nightmarish Darkrai, and makes it all the way to the finals of the Sinnoh league with his single companion. Even when Ash and Sceptile manage to defeat Darkrai ...

Ash has made it to the semi-finals of the Sinnoh League, where he goes up against Tobias - the mysterious Trainer who has the Mythical Pokémon Darkrai on his team!