1. Showdown in Pewter City
: I know it is one of the "pity" badges Ash gets, but I just love this episode. I like how it was "the ultimate challenge" Ash had faced up to this point.
2. Clefairy and the Moon Stone
3. The water flowers of Cerulean City
4. The Path to the Pokémon League
- for the first filler in the show's history, I think they did a good job. For the rare occasion, TR's dimwitted-ness was actually funny. Also, despite it being a filler, I feel there is still some character development in Ash.
5. The School of Hard Knocks
- love the idea of a Pokémon training school. I do think they should have shown a teacher, though, but everything else was great.
6. Charmander - The Stray Pokémon
- I think this is the best "Pokémon capture" episode ever made.
7. Mystery at the Lighthouse
8. Electric Shock Showdown
- Gotta love Ash's first non-pity gym victory.
9. Battle Aboard the St. Anne
- Shows off almost all of the major features of Pokémon (trading, battling, TR, etc.) in one action-packed episode.
10. The Ghost of Maiden's Peak
- This is probably my favorite Pokémon filler ever. I love the Japanese feel to it. Reminds me of Inuyasha. This episode also shows how dumb 4Kids' censorship is: They are usually very authoritarian with censorship, but they kept Brock's "bathing suits, and girls to wear them" line including a picture of women in bikini's.
11. Abra and the Psychic Showdown, The Tower of Terror, and Haunter vs. Kadabra
- I put these three episodes together because this is a three-episode arc of Ash's battles with Sabrina. I love how they give Sabrina a backstory and character development that is more than just "she is a gym leader".
12. Pokémon Scent-Sation
13. Hypno's Naptime
14. The Punchy Pokémon
- Pokémon + Rocky. Gotta love it!
15. The Ninja Poké-showdown
16. The Flame Pokémon-athon
17. Ditto's Mysterious Mansion
18. The Battling Eevee Brothers
19. The Song of Jigglypuff
20. A Chansey Operation
21. The Ultimate Test
21. The Breeding Center Secret
- by the way, this is the first time we ever see Butch and Cassidy
22. Beach Blank-out Blastoise
23. Clefairy Tales
24. Holiday Hi-Jynx
- I love a Pokémon Christmas episode!
25. Showdown at the Poké-corral
26. The Evolution Solution
27. The Pi-Kahuna
- I think this is another episode everyone should watch. I think that aside from TR's typical stuff, this episode has great writing.
28. Go West, Young Meowth
- This is not called "Hollywood Heartbreak", Viz Media!!
I like learning about the major characters' backstory, and Meowth's was really good. Interesting that Meowth is an American.
29. All Fired Up
- aside from the cheesy moments (TR stealing the flame, the spirit inside the flame saving the day), I like the way they show the opening ceremonies. Just like the Olympics
30. Round One-Begin!
31. The Fourth Round Rumble
- My favorite battle in all of Ash's Pokémon League tournaments
32. A Scare in the Air
33. Pokéball Peril
- I'm still waiting on an in-show answer on what's up with the GS Ball!!! (as in, them say in the show what it really is and what's in it, not just some scrapped answer that the show's makers say in the real world.)
34. Pikachu Re-volts
- The best Orange Islands episode IMO.
35. The Crystal Onix
36. Stage Fight
37. Snack Attack
38. The Mandarin Island Mismatch
39. Wherefore art thou, Pokémon
40. The Mystery Menace
41. The Pokémon Water War
42. Hello Pummelo! and Enter the Dragonite
- I think this two-episode arc has the greatest single battle in Ash's career