An epic filler I think and very funny! It is also the first time they use a Sonans balloon for transportation. The group will still get the key anyway even if Nyarth was the one to hold the key. Critical mistake is that Sonans suddenly appeared such that Satoshi and his friends discovered. I think they should have success stealing Pikachu in the first place, then reunite immediately in the next episode just similar to what they did in the early DP. They quarrel then suddenly the balloon exploded and dropped somewhere that can be found by Yorunozuku.