I'm just wondering, but are you planning on hacking the Hoenn Dex in PureGold, or are you just going to use the National Dex? Because I've been trying to figure out how to hack the Hoenn Dex in R/S/E without changing the National Dex order, and I haven't had much luck, since the only thing I've been doing is just changing random bytes with a hex editor.
One time I somehow made Krabby #147 in the Hoenn Dex, but I don't know how I did that.