Takeshi may be his usual one-note self in this one, but at least he's funny. I always get a kick out of his mortified faint after Hiiragi mentions that she was more impressed with Satoshi and Kasumi's battling skills. (And for good reason, too - all Takeshi does is send out Iwaku who almost immediately succumbs to Utsubot's Sleep Powder.)
Again, Musashi-tachi make this episode a lot of fun. I can't help but laugh at that shot of the valley after they've dug everywhere the inexperienced Donfan has supposedly led them to, and there are holes in the rock wall in addition to the ground. Musashi screwing up the hidari-uchiwa idiom is another good "they can't do anything right" joke. And probably my biggest laugh came from the beginning of the episode, when the three of them get crushed by that boulder. "YA NA K--"*wham* (The fact that it's in a wide shot and we only see the puff of dust rising up from the trees makes it a hundred times funnier.)
It's a filler, but it's a pretty good one. Yeah, we don't get much in the way of character development, but at least Satoshi's Heracross gets some more experience. That's always a plus, given how briefly it'll be on his roster.