pokemon blue , red , and yellow be almost the same . except mybe blue version have 1 or 2 more pokemon than red , or vice-versa , but yellow , u can tell the difference . number one -- there be actually a little bit of color when u play it on Game Boy Color system . number two -- Pikachu follow u around the stage instead of carry he in a pokeball . number three -- Pikachu say he name instead of do all those annoying noise , but all the other pokemon still do though . also , drawing of the pokemon get better also .