Lucario to be Fighting-Dark. (Where the heck did Steel come from -.-)
I must agree about the steel part, but he should be Fighting/Psychic IMO, I mean, ARUA guide pokemon?, though he doesn't need any change drasticly
Garchomp to be Dragon-Dark. (It doesn't look like a Ground type)
No, his whole evo line is part ground, he learn ground moves, the only dark move he learns is crunch, and he DOES look like ground/dragon
Gyarados to be Water-Dragon or just Water. (can't fly...lol)
*sigh* the reson Gyarados is part flyinf is cuz he is based on a jap myth about a little weak fish (Magikarp) who swan up a waterfall, so the gods made him a FLYING serpent(though GF need to make him learn Fly)
Swellow to be pure Flying and Staraptor to be Flying Dark.
WTH are you talking about, if there will be a pure flying type it would be a gust of wind, or a cloud (though a cloud can also be flying/water), and Staraptor? Dark?! Whats so Dark about him?
many more but i can't be bothered.