Besides the obvious new weather inducers,
Dragonite. Now that the metagame is bulky-oriented and the new ****-YOU-SCALE, Dragonite is now officially the greatest dragon of all time OF ALL TIME!
Venasaur. Use to be top-tier in UU, Now it's top-tier in Sun in general. Thanks to perma sun+chlorophyll and growth no longer sucking, Venasaur is now pro.
Blaziken. Lol Speed-boost
Chansey. Did anyone expect the eviolite to be real and make Chansey the bulkiest pokemon in existence? No. Surprise!
Alakazam. Magic Guard. Exactly what Alakazam needed.
Cloyster. Shell smash was specifically engineered by top tier gaming scientists to turn this thing into a killing machine. It worked.
MewtwoTHOUSAND is an original character DO NOT STEAL.
Oh and I use cheating devices to hack legitimate pokemon that I use for my own amusement only, get over it.