Pokemon Season 13 Episode 658 - The Semi-Final Frontier Episode Title:The Semi-Final Frontier.Episode Description:After his big victory over Paul, Ash discovers that his next match is against the strongest contender in the entire Sinnoh League, Tobias, who has easily won every battle, to reach the semifinals using only his Darkrai. Darkrai is able to easily take out Ash's Heracross, Torkoal and Gible using its Dark Void, Ice Beam, Dream Eater and Dark Pulse attacks. Ash brings out Sceptile, which manages to defeat Darkrai using Leaf Blade. This becomes the very first time for Tobias to have lost a single Pokémon, up to the semifinals in the Sinnoh League. Tobias surprises everyone with his second Pokémon, Latios. Latios defeats Sceptile with Giga Impact. Ash sends out Swellow. After a brief battle, Swellow is also defeated by Latios's Luster Purge. Ash's final Pokémon is Pikachu. After a long battle, both Pikachu and Latios are declared unable to battle. With all 6 of his Pokémon eliminated, and being able to defeat only 2 of Tobias's Pokémon, Ash loses the battle. Tobias wins the final battle, with just Darkrai, and wins the Sinnoh League.