Pokémon Adventures: FireRed & LeafGreen

This chapter returns to the characters of Red, Green, and Blue, protagonists of the original Red, Green & Blue chapter of Pokémon Adventures. Red and Blue are forced to explore the Sevii Islands to look for Professor Oak who was kidnapped by a Deoxys. Meanwhile, Green has finally located her parents; however, just as she is about to meet them, they are swallowed up by a mysterious black hole. Red, Green, and Blue must locate the missing relatives with the help of a former foe, Lorelei, and Mewtwo while defeating Team Rocket again at the same time. Back in Kanto, Silver is seeking his parents as well, with the help of Yellow.

(Source: Bulbapedia)