* Mega Kyogre/Groudon/Rayquaza.I. don't. want. it.
* Old Gym Rosters <- This one. I utterly hated the rosters of Tate&Liza and Wallace. The twins only had 2!! Pokémon. I understand this was a double battle, but come on. Emerald fixed this.
And then Wallace. Luvdisc? Sealo? Seaking? There are so many awesome Water types, and GF gave him 2 that suck, and 1 already use TWICE by Glacia. Why not Huntail, Ludicolo and Gyarados?
* Duplicate Pokémon. Similiar to the previous. This one applies to Flannery, Norman, Glacia and Drake. Flannery using 2 Slugma (Give her Combusken or Numel instead), Norman 2 Vigoroth (Give him Linoone/Spinda/Girafarig). Glacia is ok though, since there aren't any other Ice types to choose from. If GF only expanded the Pokédex with evolutions like Magnezone and Froslass, she could at least have 1 duplicate less. Now Drake; replace that darn Flygon with Kingdra.
* Same Trick House. Just bring better puzzles (like based on the gym's types) and no mails.
* Rare Pokémon. It is cool if some Pokémon are rare, but RSE just broke the limits. I played Ruby in 2004, and when playing Emerald in 2005, I noticed a trainer with a Pinsir. Never knew that bug was in the game. After like another year or two, I realised Heracross, Phanpy, Vulpix, Muk, Corsola and Rhyhorn were in the games. Just fix this.
* Wallace as champion. Steven Stone rocks. (Get it?)
* Removal of Battle Frontier Since HG/SS replaced Crystal's Battle Tower with a Frontier, it seems likely they'll do the same thing.
* The favor of Blaziken
* Drastically change of PokéNav.
* Old contests.
* Same post-game.