If you have epilepsy, I strongly advise you to not watch this. In this episode, Nurse Joy has difficulties using the Pokémon Transfer Machine. Whenever she tries to transport a rare Pokémon to another city, the Pokémon goes missing and a different one is transported instead. With the help of the designer of the machine, Ash, Brock and Misty are transported into the computer only to find that the culprits are Team Rocket who transported themselves to steal the rare Pokémon. Meanwhile in the Pokémon Center, Nurse Joy gets someone to install an anti-virus into the system. However, what she doesn't know is that installing the anti-virus will target anyone inside the computer, including Ash and the others. This is the part that caused many seizures when the episode aired because of the explosions caused by the anti-virus' missiles and Pikachu's counterattacks which create even more flashing images (I don't have epilepsy and my eyes started hurting after watching this). Ash, Misty, Brock safely escape, Team Rocket thanks them for getting them out of there before running off and the Transfer System is operating correctly. I would've said this was a good episode if it weren't for the flashing images.