On the way to the Battle Factory, Satoshi and friends get sidetracked at Mt. Moon. Kasumi, Masato, Pikachu, Kasumi's Ruriri, and a Py get separated from the group and try to reunite.
Once the group is back together, Team Rocket attacks with a vacuuming mecha that threatens to suck up Pikachu. How does Pikachu escape this peril? Read the Bulbapedia guide or view the Bulbagarden Archives screenshots to find out!