Got my Gateway cart, and found some interesting data you all might find tasty.
1. I corrected the full-belly code, as the one provided on this site had incorrect addresses (but correct values) for the second and third lines.
2. Pokemon with multiple formes take up one slot PER forme. This includes mega evolutions. Megas are usually* stored immediately after the final stage of each evolutionary line with a mega evolution.
3. There is a range of values between the gen-6 starters' evolutionary lines and the rest of the gen-6 Pokemon which will turn you into a weird "zombie Pikachu". This range is roughly between 0x0310 and 0x0370 or so. I will determine its precise boundaries later.
Here is the corrected full-belly code:
0x00A130D8 0x00004E20
0x00A131E0 0x00004E20
0x00A132E8 0x00004E20
*So far, I've found that Mega Sceptile is an exception to this rule. I will have to determine where his data is stored (will have to find a Sceptile or turn myself into one, then find an awakening emera, then look at the Pokemon ID address).
Also, have yet to run into an awakening emera since using the cheat codes. Hopefully my "drought" will end soon so I can pin down the awakening timer value (and freeze it at 0, so you can get unlimited awakening time).
And as for those who are lamenting the lack of Primal Reversions for Kyogre and Groudon, I have a solution to that problem--the primals are stored immediately after each Pokemon's standard-forme value. And...they come with their respective abilities.
One question I will ask, however: is it possible to obtain Black or White Kyurem in this game?