Lucario is way cooler than Mewtwo in my book. Alot more mysterious. way more Charasmatic. I saw the movie today Im like "yeah. that would make a great Dsmash." when he shot the energy balls at the houndoom.
Golduck is way too unpopular and not very recent. Lucario on the other hand....
Peoples... dont just pick pokemon to be like "Well. this is like Lucario/Mewtwo! they should be in!"
Pikachu was in because of Anime aperance.
Same with Jigglypuff.
and Mewtwo.
and soon to be Lucario Hopefully
Golduck showed up in maybe 2 or 3 episodes. Jigglypuff showed up everey other three.
Pikachu is in everey (if not almost everey) episode.
Mewtwo and Lucario have their own movies.