Seasons 6, 7, and 8.
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Ash's Pokémon in the Hoenn region are Pikachu, Taillow/Swellow, Treecko/Grovyle/Sceptile, Corphish, Torkoal, his original Bulbasaur that he left back home and Snorunt/Glalie.pikachu(obviously)toarkoalcorphishtreecko(which evolve into grovyle then sceptile)snorunt(which evovle into glalie)
Ash caught Treecko in the seventh episode of the Advanced Generation serries and the two hundred thirty first episode of the Pokemon anime.
season 8 episode 395
The episode in which Ash brings his Bulbasaur over to the Hoenn region for the first time is called "Hokey Poké Balls."
in the last episode of the hoenn region where ash's sceptile is participating in a contest with may's blaziken the paaworld