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If anyone wants spoilers for some events that will happen in the advance season, here you go. I got all this info from
www.Serebii.net
**Major Spoilers**
Pokemon that Ash gets-Treeko, Corphish, Taillow.
Pokemon that May gets-Torchic(I know you probably already know), Wurmple(which evolves into Beautifly),
Brock returns to the group only a few episodes into the season, and he catches-Mudkip, Lotad
Misty Returns eventually and has these new pokemon-Togetic, Gyarados
Both Misty and Brock have new clothes.
May decides not to collect gym badges, but instead to compete in pokemon contests.
Mays Brother, Masato, joins the group when they are at Petalburg city. He has no pokemon, but is a pokemon expert. He has a pokeNav.
Jessie lets Arbok go. She then captures-Wurmple(which evolves into Dustox), Seviper.
James lets Weezing go. He then captures-Cacnea.
But its odd, now instead of the usual group of 3, there is now 5. Ash, Brock, Misty, May, and Masato.