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4=2>6>1>3>5
4 is top because it's the game that rekindled my love for Pokemon. 2 is also number-one by proxy of HGSS fixing all of its problems with move distribution and exp grinding. 3 is low because I read too many spoilers and ruined the magic.
5 is worst because it has a ton of redundant designs, an overly-dramatic, chuunibyo plot, and a postgame that was a barren wasteland with nothing interesting to do. Points off for sending you through that wasteland in BW2 without any improvements.