It's Still Rocket Roll to Me! - S8.E7

The heroes arrive in Mossdeep City, but learn the Gym Leader Ash wants to battle is at the Mossdeep Research Center. Once they arrive there, the heroes meet up with Tate and Liza, who just had a battle. Learning these two are duo of Gym Leaders, Ash is surprised he has to fight them in a Double Battle. While spending some more time at the space center, Max and Tate go to a space shuttle, only to encounter Team Rocket, who wants to steal the space shuttle.