Original: The games ' releases marked the beginning of what would become a multi-billion dollar franchise , jointly selling millions of copies worldwide , and in 2009 they appeared in the Guinness Book of World Records under '' Best selling RPG on the Game Boy '' and '' Best selling RPG of all time '' .
Simplified: Reception Pokémon Red and Blue got good reviews , and their releases started the beginning of what would become a multi-billion dollar company , both selling millions of copies around the world .