Roy and Ult have lost in their battle with the yellow Lucario, nicknamed the "Yellow Blast". They try to challenge Lucario to a rematch which is when Master Mayonnaise appears in front of them. He suggests Roy and Ult to have a Pokémon battle! However, Ult finds himself struggling, unable to get in sync with his Sableye. The path to becoming the Mega Strongest is going to be full of difficulties!?
