These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
This has slowly become prevalent with the Unova Arc. In general, it's agreed that the initial stages of it were not the problem; however, an overly-extended amount of time spent in the region, coupled with slow movement and several seemingly unnecessary stops has started to wear out the region's welcome.
Designated Villain: Team Rocket, primarily due to how forceful their takeover was implied to be and because of the public disturbances that their Mooks have caused. Contrary to popular belief, however, Team Rocket's reign has had a fair number of positive effects on the Kanto regions, and the Shadow Admins have made a point of stopping the trouble caused by their lower-ranking group members.
Moral Event Horizon: Shadow Admin Ace authorizing the reactivation of the Shadow Pokemon project, effectively allowing a group of scientists to perform unspeakable experiments on Pokemon to turn them into super soldiers.
Sabrina has one after killing Archie when she takes his Pokémon, still inside of their Pokéballs, and psychically crushes them, killing all of them as a result.