Pokemon the Series: Ruby & Sapphire Season 603 Episode 1 A Three Team Scheme!

Ash and friends meet up with Professor Birch and accompany him as he investigates some nearby caves. Inside one they discover a hidden room, occupied by a young boy named Keanu who quickly drives them out of what he calls his "secret base." Closely tailing Ash and friends, the Team Rocket trio don't respond nearly as politely to the boy's request, instead kicking him out and claiming the base (and Keanu's team of Nincada) for themselves. The plot thickens when the two rival Hoenn gangs, Team Aqua and Team Magma, infiltrate the very same cave, thinking it to be the legendary Cave of Origin. Eventually, they realize their mistake and leave the secret base to Team Rocket--but not for long! Our heroes are right there to stop them and get Keanu's Nincada back.