Axew Gets Lost is an entertaining (not amazing) episode and actually felt more like a League episode (with all the amazing festivities). A very good league which ranges for a span of 7-8 episodes will become excelllent with a filler like this. The league is not just about the battles, it is about the festivities also.
So yeah, don't blame the Axew Gets Lost episode for the league to be crappy. If anything, blame any of the other crappy fillers in the rest of Best Wishes if you want.