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Season 2, 4, 5 and 10 (9 coming in close though
btw, I should add that my season standard is that a season changes whenever a new opening is added
I know it's not the correct way but the other way's too confusing.
Advance Generation. That season appealed to me for some reason, maybe the entire change in clothing or maybe the introduction of May and contests, something about it stood out for me.
Indigo League, Master Quest, Advanced Battle, Battle Frontier and D/P. The worst is easily Johto League Champions which is set in the FillersVille region.