Welcome to the wacky world of PokéDex Colours, haha! As bizarre as it seems, this is entirely canon information simply being reflected here on-site! Did you know Fennekin is considered "Red?" Or that Weepinbell is "Green?" Or that Mareep is "White?" It gets a bit weird in some areas, haha! And don't even mention the fact that there's no Orange! /lh To answer your question, though, no, it's not an error; just a slightly odd decision made by The Pokémon Company & GAME FREAK, haha! ^v^ - Juku