Emolga sounded the same to me as the Japanese version, if it is the same voice then I don't mind since I like the sound of it.
I liked Swoobat's voice as well.
Bianca sounded different too me, maybe it's because I haven't heard her in the dub for a while and forgot her voice. Regardless, I enjoyed her in this episode.
I love Galvantula's voice, but again it sounded different to me.
I enjoyed the episode.