https://www.dropbox.com/s/dxhli38g6kt2i36/AdvanceMap%201.92.zip?dl=0
this a-map is the one pokefreak was talking about
if you search up just a-map 1.92 you likely won't find baitot's version linked above
to repeat, D027C has two bytes there: 89 02. switch these two bytes around in your head to get 0289. in decimal, this is 649 (and is also NOT the default 019C, I must have edited it myself, hehe). so, if you want to expand the amount of pokemon to say 1020, then you'd just have to convert 1020 to hexadecimal (3FC), split it into two groups (03 FC), and then reverse it (FC 03) and put it at D027C using a Hex Editor of sorts.