I didn't get the point: after all those bonding moments Lana has with Dewpider, after all the adorable moments Lana had with Dewpider (including Dewpider crushing on Lana), Dewpider isn't caught by Lana??? It just made zero sense. The whole episode seemed to be a perfect setup for Lana to catch Dewpider.
I liked the unique approach the episode took, like following Dewpider all the time instead of following Ash and co, with Dewpider getting thrown away here and there. Also Dewpider being unable to breathe outside water without creating a bubble-helmet seemed a cute thing, which made it seemed more adorable. Lana/Dewpider bonding moments were really cute, but the end result of the episode, a.k.a., Lana not catching Dewpider definitely makes the episode a disappointment.
Because no matter how good majority of the episode was, it doesn't make much sense if it doesn't serve the purpose it seemed like it would. The whole episode was an excellent set-up for Lana to get Dewpider, and there's literally no excuse after all that set-up for Lana to not get Dewpider.
5/10, and that too because I liked how adorable this Dewpider was and enjoyed the Lana/Dewpider bonding moments.