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Errr, Maybe just all the features that R/S and G/S/C had? like night/day, berries, setting an item to "select" not having to select HMs to use from the pokemon menu, breeding, and Pokemon Contests? maybe even a poke/nav/gear.
But, has anyone seen
https://www.gamespot.com/gba/rpg/pokemonred/news_6075891.html
This? It's apparently some sort of wireless link cable. it says that Pokemon Fire Red and Leaf green will be the first games to be compatible with it. Nifty.