Kangaskhan and a Spoink would make a sick kind of kangaroo thing... I mean a pouch and hops around...
Castform and Ditto with Keckleon's ability would make the ultimate transformation pokemon, very unstable of course. He would be like a gas atom zipping around really fast. The moves I made kinda quick so oh well...
lvl 5 transform
other levels weather moves
lvl 16 weather ball