Maylene used her Riolu in her battle against Platinum. Riolu battled against Pearl's Monferno and Pearl's Chatot who were given by Pearl to Platinum to use in the gym battle. Riolu was first used against Monferno and it successfully dodged all Monferno's attack with its speed. It later used Force Palm on Monferno, slamming Monferno to the ground. It then directly used Drain Punch to absorb all Monferno's strength. Platinum switched Monferno out for Chatot and Chatot used Chatter to irritate Riolu. Maylene commented that Riolu's aura was emanating and that Meditite felt that Riolu was in danger. Maylene then switched Riolu out for Meditite.
After Meditite was knocked out by Chatot, Maylene sent Riolu back out and easily knocked Chatot out with Vacuum Wave. Platinum sent Monferno again and Riolu and Monferno attacked each other at the same time. Riolu later used Rock Smash to crush the entire arena with rocks and moved with its speed through the rocks. Platinum used her slots skills that she had developed in the casino to sense where Riolu was. Platinum found Riolu and ordered Monferno to attack in the direction she sensed Riolu. Monferno successfully hit Riolu and knocked it out, making Platinum the winner of the gym battle.
Riolu appeared again with its trainer when they were training in the snow with Platinum and Candice. There they encountered a Sableye and Sableye started to attack them. Riolu was hit by Sableye's Shadow Sneak. Jupiter revealed herself to be the owner of Sableye and her Gastrodon appeared as well. Candice was hit by Gastrodon's Mud Bomb and Maylene ordered Riolu to help her out. However, Riolu was hit by Gastrodon's Mud Shot before Riolu was able to help Candice.
|Force Palm||Magnificent Meditite & Really Riolu II|
|Drain Punch||Magnificent Meditite & Really Riolu II|
|Vacuum Wave||Magnificent Meditite & Really Riolu II|
|Rock Smash||Magnificent Meditite & Really Riolu II|
|Aura Sphere -||Double Trouble with Dialga and Palkia II|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.