I had a list of all my favourite episodes somewhere on the internet...I have about 30/40. Oh well, here's the one's I rememeber
Ghost of Maidens Peak Indigo League
Electric Shock Showdown
Pokemon Shipwreck
Sabrina episodes (Ash: Muscle over mind!!)
Holy Matromony!
The Ultimate Test
The Breeding Centre Secret
Blain episodes
Go West, Young Meowth (Meowth is my favourite character)
Pikachu Revolts Orange Islands
The Fortune Hunters Johto Journeys
Lugia arc Master Quest
Plant it now...Diglett later
An Egg-Sighting Adventure!
Due's and Don'ts
Just Waiting on a Friend
Enlighten up!
Will the real Oak please stand up? (I found it really funny...)
One Trick Phoney
Great Bowls of Fire
Here's Lookin' at you, Elekid!
Address Unown
Pop Goes the Sneasel
A Tail with a Twist Advanced
A Hole Lotta Trouble!
Abandon Ship!
Having a Wailord of a Time
A Double Dilemma Advanced Challenge
Its Still Rocket Roll to Me
Claydol, Big and Tall Advanced Battle
Hail to the Chef
Sweet Baby James Battle Frontier
King and Queen for a Day (simply for the hilariously random Gotta Dance ending)
Different Strokes for Different Blokes D/P
Gymbaliar
Mutiny in the Bounty
...
For anyone slighlty disturbed, I used an episode guide to get the titles. I've just finished watching my Master Quest box sets, so that explains why so many are there. I haven't really watched many Advanced Challenge eps and its been ages since I've watched Orange Islands/Johto