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[ASM & Hex] [Gen II] Adjusting the EXP formula in Gold/Silver/Crystal?

rusticolus

Grass/Flying
    • 36
    Posts
    16
    Years
    • Seen Jun 19, 2023
    Hi there!

    I'm trying to modify the exp gain formula in Gold/Silver/Crystal. I figure there are no tools for this, and thus requires hex editing, which I'm moderately familiar with. The issue is I don't know how to go about finding the location of the exp formula in the hex code. Any advice on where to start?
     

    Crystal_

    • 171
    Posts
    11
    Years
    In Crystal it's at 0x50efa but I'd have to check in Gold/Silver. There are six growth rate formulas, two of which are unused (second and third). Each formula is four bytes.

    The exact structure of each formula is as follows:

    Code: 
    { ([COLOR="Red"]\1[/COLOR] >> 4) / ([COLOR="red"]\1[/COLOR] & 0xf) } * Lv[SUP]3[/SUP] + [COLOR="red"]\2[/COLOR]*Lv[SUP]2[/SUP] +[COLOR="red"] \3[/COLOR]*n - [COLOR="red"]\4[/COLOR]

    Where the numbers in red correspond to each of the four arguments of each formula. [2] is signed. For example, the medium slow (parabolic) exp rate entry reads as:

    Code: 
    0x65 0x8f 0x64 0x8c

    Which means:

    Code: 
    (6/5)*Lv[SUP]3[/SUP] - 15*Lv[SUP]2[/SUP] + 100*Lv + 140

    Information taken from the pokecrystal disassembly: https://github.com/pret/pokecrystal/blob/4e2487c/main.asm#L4477
     
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