(EMERALD) Scale EXP Gain by Level (ASM)

9thgenbae · Sep 12, 2023

Hey guys so I just finished writing this routine. What it does is change how much EXP you get depending on your Pokemon's Level compared to Opponent's Level. Specifically, for every 1 level difference, EXP will go up or down by about 13%. Increase is uncapped, decreased is capped at 65%. Example: 100 exp gained for beating a lv 15 with a lv 10 will become ~162 Exp with this mod.

The Assembled Routine is ... (Disassembled at bottom)

Code:

10 88 F8 B4 00 25 14 4B 1B 78 64 26 73 43 13 4C 1B 19 54 33 1B 78 12 4C 24 78 74 43 11 4D 64 19 54 34 24 78 A3 42 11 D0 A3 42 05 D5 E3 1A 05 1C ED 08 6B 43 C0 18 09 E0 1B 1B 05 2B 04 D5 05 1C ED 08 6B 43 C0 1A 01 E0 05 23 F8 E7 F8 BC 08 60 89 46 05 48 00 47 00 00 20 00 04 02 EC 44 02 02 70 40 02 02 44 47 02 02 6B A6 04 08

Open Emerald Rom in HxD, and add the above code in free space (bytes FF) in HxD. Write down the offset you added it. I added mine to 0x00EB3000

Now to hook the routine and make it run, in HxD, now goto 0004A644 (This is our Hook Offset). At this offset, add in the code below.

Code:

00 48 00 47 (XX XX XX XX)

Replace the XX's with a POINTER made from the offset you added the first code at (must turn offset into pointer).

So mine looks like this.

Code:

00 48 00 47 01 30 EB 08

To make the Pointer, take your offset (mine was 00EB3000), replace the first 0 byte to 08 (signifies Rom Memory) , add a 1 to the last byte, and then write the 4 bytes in reverse. Look below to see exactly how.

1st step

Code:

00 EB 30 00

2nd step

Code:

08 EB 30 00

3rd step

Code:

08 EB 30 01

Final step, reverse the bytes

Code:

01 30 EB 08

And that is it. I just made this, tested it out and everything seems to be working in good order so far. There's a chance an error could come up in the math, like a exp value that is way bigger than it should be but i dont think so. Sorry if i didnt format this post that great, I don't post much lol. Any questions lemme know! Enjoy ! (Disassembled code below)

Code:

.THUMB
.ALIGN 2

LDRH R0, [R2]
PUSH {R3-R7}
MOV R5, #0
LDR R3, = 0x02040020   @Current Player Pokemon Slot 
LDRB R3, [R3]
MOV R6, #0x64
MUL R3, R6
LDR R4, = 0x020244EC   @Player Party Pokemon Data
ADD R3, R3, R4
ADD R3, #0x54            @Adds offset for Level Data
LDRB R3, [R3]
LDR R4, = 0x02024070   @Current ENEMY Pokemon Slot
LDRB R4, [R4]
MUL R4, R6
LDR R5, = 0x02024744   @ENEMY Party Pokemon Data
ADD R4, R4, R5
ADD R4, #0x54
LDRB R4, [R4]
CMP R3, R4
BEQ RETURN
CMP R3, R4
BPL HIGHER_SAME
SUB R3, R4, R3
MOV R5, R0
LSR R5, #0x3
MUL R3, R3, R5
ADD R0, R0, R3
B RETURN

HIGHER_SAME:
SUB R3, R3, R4
CMP R3, #0x5
BPL FIVE_LV_OR_MORE

CONT:
MOV R5, R0
LSR R5, #0x3
MUL R3, R3, R5
SUB R0, R0, R3
B RETURN

FIVE_LV_OR_MORE:
MOV R3, #0x5
B CONT



RETURN:
POP {R3-R7}
STR R0, [R1]
MOV R9, R1
LDR R0, = 0x0804A66A+1
BX R0

(EMERALD) Scale EXP Gain by Level (ASM)

9thgenbae