Oh man, thanks for the hard question lol
So many choices but I have to say:
- "Bulbasaur and the Hidden Village"
- "Charmander – The Stray Pokémon"
- "Here Comes the Squirtle Squad"
As these episodes really showcase the way Ash goes about catching his Pokemon, through friendship and respect.
I also have to say:
- Gotta Catch Ya Later!
as for episodes with titles I don't remember: Noibat's development of being able to fly, ASh's battle against Olympia, The arc where The St. Anne sinks, Johto in general was great, The Sinnoh League arc and when Gligar evolved into Gliscor, and all the Battle tournaments in Unova