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Originally posted by: Spak-Spang
Lucario replacing Mewtwo, you know I have no idea about this...but Mewtwo is old hat. I don't think anybody really cares about that character anymore. It was cool thinking about an evil cloned Pokemon bent on distruction, and as such Mewtwo is the perfect villian character to represent the Pokemon series, but Lucario may be more popular now, and as a legendary Pokemon more interesting to play as.
Mewtwo is still in the most seen of the theatrical movies, and had an OVA just about him as well. Plus Leaf Green and Fire Red were released not that long ago, and let's not forget that the Pokémon trainer in the game also uses the classic three, instead of the newer starters.
Also, for the record, Lucario is not a legendary Pokémon.