Back when Tigers used to smoke.
So the most controversial feature easily has to be the lack of wild Pokemon battles. I can understand why people are angry about this, having to waste their Pokedollars on Pokeballs constantly and fill up their PC boxes in less than a week just to grind their Pokemon. At the same time, GameFreak is insistent that they will never give up this change. So I feel their's an easy solution to this that they can easily put in the Let's Go titles as part of a patch/free DLC! The VS. Seeker that will allow you to grind and train to your heart's desire against Pokemon Trainers! Also it just makes a lot of sense lore-wise that you'd be likely to train more against other trainers than Pokemon.