A Six Pack Attack! - S7.E31

The heroes decide to stop at Professor Birch's lab. Hearing Professor Oak will come to the lab as well, Ash and Brock decide to accompany Birch to escort Oak to the lab. However, Professor Oak arrives by a cart and greets May and Max, the latter being a big fan of his. Once Team Rocket steals Birch and Oak's Pokémon, May, Max and Professor Oak decide to go after them and rescue the Pokémon on their own.