D&P episode where Paul beats Ash and his team so bad that they
have to all get bandaged up. That was the same episode where Grotle
became a Torterra, go figure.
We don't talk about the B&W anime. I can't remember a single
somewhat tolerable episode where Cilan didn't constantly tell the
audience three times an episode that he was a connoisseur of
pokemon/cooking/your father's paycheck. Who thought replacing Brock
with that guy was even remotely okay.
The Tower of Terror, for sure.
I love all the pokemon in the Ghastly evo line, although I must
admit I was disappointed when Haunter went with Ash instead of
Gengar. Who doesn't love that smiling fat purple blob?
I was totally invested in the Ash/Misty ship even when I was young,
so the episode where they danced together in kimonos, the episodes
where she left, and the few episodes when she came back around
(when Togepi was going to evolve) are some of my favorites.
And, yeah, the episode where he tried to leave Pikachu with all the
other Pikachus was a killer back then.
Oh! And the episode where Charizard was frozen and Ash worked so
hard to thaw him out and save him, finally earning his trust.