-Trade evolutions... WHY!?
-The plot is always the same. They should put a little bit of imagination in it, starting with making it longer and more unexpected.
-Too many legendaries (there are more than 50, what will be next, a Legendary that makes muffins?), too many forms, and some of them don't have a characteristic thing to make them different from the rest (e.g. the legendary birds)
-Some types are unbalanced, for example, Dragon has passed from being the strongest to one of the weakest
-The next new thing will be Agumon as a starter ¬¬ Seriously, a Megaevolution: it can be only used in battle but it disappears as soon as it ends or the pokemon is defeated. Strange, but it sounds familiar...
-I liked Emerald, HGSS and Platinum more than their originals. R/S didn't have anything after the League, G/S was very good but lacked something, as did D/P.
-B/W and X/Y were incomplete. Their lack of... well, anyting was even worse than R/S
-Gen I, mainly Red and Blue, is overrated, and this happens with many games (cofFFVIIcof)
-I don't like Charizard, but I had to choose it because there weren't good Fire types ingame. This leads to the lack of variety in some types, for example, Fire or Electric
-In the anime, Ash forgets everything he learned in previous journeys, except the Kanto Journey (the first one). I think that ther should be a new main character, or instead of going with Ash, the story should continue with other of the main ones, like May or Max, and then after a couple season, with one of the friends that journeyed with them. They can be with previous main characters, but not more than a couple episodes.
-Rock types (specially when coupled with another type, like Ground or Water) are too weak, their biggest vulnerability usually OHKOs them