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Crystal (stat exp makes single player so much more fun than EVs and natures because of how unrestrictive they are, and Crystal is probably the best of gen 1/2 in terms of content)
B2/W2 because of how much actual content there is, in addition to replayability in terms of Hard mode NG and various competitive CPU formats
Platinum for the same reasons as B2/W2 while also being a member of the best competitive generation for PVP battling