Hmm... ok then.
Did someone already did Generation V+ gain EXP system to Emerald (or any other base rom)? To think about it, typing 256 (01 00 in hex) EXP base on a Pokemon makes it not work or the first byte might overtake something (fixing the entire table is really needed).
I was doing a Emerald hack... I have done possible expansions (except expanding Pokemon)... But until last week... I just heard that MrDollSteak will make his ROM base for Emerald... so I just stopped and wait for it LOL. Rather than doing a hack today, I ended up helping and contributing sprites to MrDollSteak's Sugimori Palette thread. I just made few custom second frame sprite for Gen V Pokemon.