You know, there's a difference between "seasons" and "regions". The way I see it, if we're talking about American seasons (since the Japanese don't have traditional TV seasons like us), they're laid out like this:
Season 1: 1998-1999 ("Pokémon! I Choose You" to "The Breeding Center Secret")
Season 2: 1999-2000 ("Princess Vs. Princess" to "Charizard Chills")
Season 3: 2000-2001 ("Pokémon Water War" to "The Fortune Hunters")
Season 4: 2001-2002 ("A Goldenrod Opportunity" to "Machoke, Machoke Man")
Season 5: 2002-2003 ("Around the Whirlpool" to "You're a Star, Larvitar")
Season 6: 2003-2004 ("Address Unown" to "Watt's With Wattson?")
Season 7: 2004-2005 ("What You Seed Is What You Get" to "Judgement Day")
Season 8: 2005-2006 ("Clamperl of Wisdom" to "Hand-to-Hand Fighting Dojo! Satoshi Vs. Haruka")
Season 9: 2006-2007 ("Psychic Vs. Ghost! Midnight Duel" to ----- )
That being said, I greatly prefer the first season. There's a loose and uninhibited feel to those episodes that I don't think the show will ever get back.