Agreed with all shengar had to say. I don't think any of those Pokemon, except maybe barring Floatzel, need a change or upgrade. Especially Victini or Gyrados. (Not to mention that would also mean Milotic needs a boost).
I don't think any Pokemon should change the type they are. That would just be messed up, unless they did evolve. If Charizard was changed from Flying/Fire to Dragon/Fire at random next gen, that would unbalance the game.
Liepard and Absol need an evolution, the feline Pokemon have been really neglected. Jynx also deserves to evolve like her two brethren did.