Pokémon are marvelous creatures that come in a variety of types and sizes, with abilities, powers, and personalities as diverse as they are numerous. Doctor Yukinari Ookido has dedicated his life to studying these fascinating beings, that can be caught, trained, traded, and battled against each other. There's only so much he can do from his lab though. With this in mind, Ookido entrusts two young boys with a Pokémon of their own and a computerized encyclopedia to catalog them. One of them, Green, is brash, passionate, slightly arrogant, and Doctor Ookido's own nephew. The other boy, Red, is equally passionate, and filled with a wide-eyed, mildly naive sense of wonder.