Some info and a short description of this South Park episode on South Park Zone:
South Park - The Losing Edge is episode 5 of season 9 of the Comedy Central series South Park. It originally aired April 6, 2005.
he boys try to lose their baseball games on purpose so they can avoid having to play all summer. Unfortunetaly, they are not able to lose and form a plan so they will not have to play all summer long. Randy gets into training to fight the other fathers at the games. The movie Rocky is parodied in select scenes. Also, The Karate Kid, is parodied, in that, the song You're the Best by Joe Esposito, inspires Randy to fight the "Batdad".
in the end Stan tells his father, "You're the greatest," as he is led away by the police in his underwear. After hearing that, Randy jumps for joy as "You're the Best" plays.South Park Spoiler Alert!
(The complete plot for this South Park Episode)
The boys of South Park are involved in a Little League baseball team, despite the fact that they all hate the sport; they play because of the enthusiasm of their parents. When they win their final game they are initially elated, thinking the season is over, but then discover to their horror that they have to continue playing in the state championships. They decide to lose their next game, and thereby get out of the running for the championship so they can enjoy their summer, but the team they oppose has exactly the same idea. While trying desperately to lose, they manage again and again to beat the other team, whose efforts at throwing the game are more effective.Stan's father Randy has long taken up the hobby of being a "trash talking dad", being generally obnoxious at every game so as to get into fights with other, equally obnoxious fathers - and ultimately embarrassing Stan since after most fights he is led away by the police drunk and in his underwear. While training to be the best fighter he can be, he becomes terrified when he meets the Denver team's "Bat Dad", who wears a purple Batman cowl and cape, is much bigger than him, and behaves even more obnoxiously. He decides not to attend the game, angering Sharon who thinks he should be there to support his son but should keep himself from getting into fights.
He decides not to attend his son's game, as Stan and the others play the Denver game, which, if they win, will force them to waste the whole summer in the national circuit. The team drafts Kyle's incredibly stereotypically Jewish cousin, Kyle Schwartz (distinguished in a previous episode as "Kyle One") to join their team, knowing he is just terrible at every single sport. Even this fails to work as the other team improved and became "really good at sucking" - they can even "bat themselves out" hitting South Park catchers with precise shots right in the fielders' gloves. Just as it seems the South Park team is sure to win, Stan's dad shows up and begins harassing Bat Dad. The two get into an incredible fight, and the announcers and umpires declare that if they continue to fight their teams will be disqualified. With the encouragement of his son and his team (though he doesn't really know why) and other illusionary people in his head (including Mickey Goldmill from Rocky), Randy keeps fighting, and the South Park team is disqualified, leaving Denver to go to the national circuit. Stan tells his father, "You're the greatest," as he is led away in handcuffs by the police in his underwear. After hearing that, Randy jumps for joy as the song "You're the best" plays.