Well... I found the red/blue stuff not really worth mentioning... things that annoy me are
-a move drops in PP as its used more and more, and the color of the font will change if the PP is say 1/2, then on and on until red at 0. However, one of the bright yellow font used is so hard to read, that even on a rom when I blew my screen to gigantic size compare to the real gameboy, it's hard to read...
-the bag is sucking more and more... TM Pouch within key item to get to the TMs is kinda stupid, as that's not as efficient as before...
-berries again... same problem with TMs
-font sizes, as mentioned
-how only some VS Seeker improves yet not all is rather stupid... either all improves, or all stay the same, or only partial trainers will verse you again with the VS Seeker or something
From the beginning I decided to not buy the game (well as if I bought any of them, but like for sapphire I actually "wanted" to buy it if I can) because it's quite a rip off to me... and even if you get 5 games of FR, LG, R, S, and even Colosseum on GCN you still can't get all the Pokemon and will need Emerald on top of them all? No...