This episode wasn't filler...It was right after Chikorita evolved, and it got character development as Bayleef between her and Ash. Ash was getting used to Bayleef's new power.

There were nice grass pokemon in this episode, and Machoke, and interesting dialogue between Misty and Brock for a change. Oh, and Bayleef learned a new attack in Body Slam. Great episode.

8/10