PlatinumMaster

Extract the overworld NARC a1/2/6.
Feed the script one of the files: python raymour_flanigan.py decompile 126_xxx.bin
Make your changes.
Recompile: python raymour_flanigan.py compile 126_xxx.s Make sure you have the b2w2.s in the same directory.
Reinsert to NARC, reinsert NARC into ROM.

Findings by "PokemonMusic" on SOUNDCLOUD, HCS64, DISCORD, LORDDRAGON3005, LUCASTHEPLATINUMMASTER, GEOTHERN1683, GARAGEBANDPOKE/Alimu, ThePokMixr92, recordreader/icecream, and Alex Naveira

STYLUS RMX (they're all RMX Grooves, unless noted otherwise)

Preset Name	Where it was used
57 Isle a (Classic)	- B2W2 Cheren Encounter
58 Motion Century	- B2W2 Nimbasa Gym
70 Eden	- B2W2 Elesa Gym Stage (alternate)
72 Liquid Frame Combo	- B2W2 Castelia Gym (Also used in Kirby's Epic Yarn's "Tube Town")

	local rshift, lshift=bit.rshift, bit.lshift
	local md,mw,mb=memory.readdwordunsigned,memory.readwordunsigned,memory.readbyteunsigned
	local gt,sf=gui.text,string.format
	local table={}
	local on,enbl,overprint,enblo=1,1,1,1

	if mb(0x023FFE09)==0x00 then -- Not "2" ~ Not B2/W2
	pos_m=md(0x02000024)+0x3461C
	zds=md(0x02000024)+0x3DFAC
	owstart=md(0x02000024)+0x34E04

	#!/bin/bash

	# Sound Fixup script.

	cd sound;

	# Voice Groups
	mkdir voicegroups;
	cd voicegroups;
	csplit -z -n 3 "../voice_groups.inc" /".align 2"/ {*} -f voicegroup;

	.include "asm/macros.inc"
	.include "constants/gba_constants.inc"
	.include "constants/m4a_constants.inc"

	.syntax unified

	.text

	thumb_func_start umul3232H32
	umul3232H32:

	#!/bin/sh -e
	# Written by PlatinumMaster, based on the work of mcd1992.

	mkdir -p /mnt/disk

	echo "Wiping the plugged in disk now, you have been warned!"
	# Wipe disk and mount it
	mkfs.ext4 /dev/block/sda1
	mount /dev/block/sda1 /mnt/disk
	cd /mnt/disk