Overall:
Base games:
B2W2>Ruby/Sapphire>Gold/Silver>Black/White>Red/Blue>Diamond/Pearl>X/Y>S/M
Third games:
Emerald>Crystal>Platinum>Yellow>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>USUM
Remakes:
HGSS>ORAS>FRLG>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Let's Go
Spin offs:
Mystery Dungeon Explorers>Colosseum>Mystery Dungeon Rescue Team>XD>Conquest>Snap>Pinball
Soundtrack:
Gen 3>4>5>1>2>>6>>>>>7
Art style
Gen 3>5>4>2>1>6>>>7
Pokemon themselves:
Gen 3>7>2>1>5>>6>>>4(I still love you though Chatot, Shinx line, Starly line, Bidoof and Palkia)
As a whole:
Gen 3>5>4>2>1>>>>>>>>6>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>7
Gen 3/5 are by far the best, I enjoy 1/2/4, but 6/7 have been disappointment after disappointment. I hope 4 gets a good remake, I love the aesthetic, the music and the region, but the engine it ran on was awful and really ruins a great game imo.