[Script] need help reading this effect asm

[Black_Fragrant]

i ve just learned how to compile, now that i can, i tried putting this in my rom, but simply following it gives me a freeze.
how do i adjust it to fit my own rom?

.text
.align 2
.thumb
.thumb_func
.global freezedry1

Main:

cmp r4, #0xB
bne RegularChart
ldr r1, .currMove
ldrh r1, [r1]
ldrh r0, .freezeDryIndex
cmp r0, r1
bne RegularChart
mov r0, #0x14
b Exit

RegularChart:
add r0, r3, #0x2
add r0, r0, r5
ldrb r0, [r0, #0x0]
str r2, [sp, #0x0]

Exit:
ldr r1, =0x0801E979
bx r1

.align 2
.currMove: .word 0x02023D4A
.freezeDryIndex: .hword 0x00B5

@1E970: 00 49 08 47 XX+1 XX XX 08

 

[Dr. Seuss]

If I remember clearly, the routine for Freeze Dry effect requires you to change the value 0x00B5 from the routine to the move index of Freeze Dry move on your hack and then compile and insert the routine to an aligned free space offset (Ends with 0 4 8 or C) and insert the hook at 0x1E970 (The XX+1 means you need to add 1 to the offset where you put the compiled routine)