Now lets talk filler episodes. I actually don't hate all of them. In order for a filler episode to be good for me, it has to make up for the lack of story progression. To do this, you have to make it as funny, entertaining, or interesting as possible so you still get a fun ride. For example, The Bicker the Better is one of my more favorite filler episode because of how much of a fun ride it is to watch. I also like A Hot Water Battle due to it starring johto starters.
However, if there's one pet peeve I have, it's when they start rehashing each other. Not with the formula, but with the plots. How many episodes are we gonna have where a main Pokemon is in love with another one only for said love interest to go with someone else?