Ignorance is Blissey.
Sweet Baby James (good acting in both, but Japanese has Smile ;__;)
Do I Hear a Ralts? (touching, develops Max, a hint of his future team, better in Japanese)
Crossing Paths (Japanese has Kaze to Issho ni).
A Venipede Stampede (learning Trip has an "end justifies the means" mentality, Ash and Trip having a moral clash and also working together after difficulties, Ash saving a Pokemon despite the danger, and a satisfying ending [minus, welll...])
Scare at the Litwick Mansion (somehow both funny and genuinely creepy, high stakes, everyone nearly gets dragged into the spirit world, Ash & friends cooperating with TRio against a common enemy).
Mission: Total Recall!! (Lillie's recovery is so incredibly cathartic and moving, also Lillie running around and hugging everyone she could was soooo cute!!!)
The Poke-spokesman (never saw it in Japanese, but the Arabic dub had good acting and Simon's plea to the electricity-starved Magnemite not to sap the Pokemon Center because there are sick and injured Pokemon relying on that energy... gutted me. Also, the ambiguity, did he understand Pokemon's spoken language or did he hallucinate to block out the storm? A good deed for Meowth, even if it was deceptive.)