>>56112897>because i heard the show is very long.lel
The Original Series covers Kanto, the Orange Islands (anime-original arc), and Johto.
Kanto is EP001-EP080 (80 episodes).
Orange Islands are EP081-EP116 (36 episodes)
Johto is EP117-EP274 (158 episodes).
Then came Advanced Generation, which covers Hoenn and the Battle Frontier, which has been moved to Kanto.
Hoenn is AG001-AG133 (133 episodes).
The Battle Frontier is AG134-AG192 (59 episodes).
After that came Diamond and Pearl, covering Sinnoh.
Sinnoh runs from DP001-DP191 (191 episodes).
Next is Best Wishes, covering Unova.
Unova runs from BW001-BW142 (142 episodes).
Then came XY, which got fairly-mainstream appeal here. This series is where the anime general spawned from.
Kalos runs from XY001-XY140 (140 episodes).
Succeeding that was Sun & Moon, covering Alola.
Alola runs from SM001-SM146 (146 episodes).
Then came Journeys, which was more a world tour than strictly Galar.
Journeys runs from JN001-JN147 (147 episodes).
Journeys concludes Ash's story.
Finally a series semi-reboot came along with Horizons, the current airing anime. It's also a world tour, but strongly features Paldea much more than anything else.
Horizons runs from HZ001-HZ56 (56 episodes so far).
So that's 1288 episodes of Pokemon for you to watch, discounting movies and specials. Have fun.