diff --git a/engine/gfx/color.asm b/engine/gfx/color.asm
index 0064edfc3..277da60b1 100644
--- a/engine/gfx/color.asm
+++ b/engine/gfx/color.asm
@@ -1334,6 +1334,9 @@ INCLUDE "gfx/diploma/diploma.pal"
 PartyMenuOBPals:
 INCLUDE "gfx/stats/party_menu_ob.pal"
 
+UnusedBattleObjectPals:
+INCLUDE "gfx/battle_anims/unused_battle_anims.pal"
+
 UnusedGSTitleBGPals:
 INCLUDE "gfx/title/unused_gs_bg.pal"
 
diff --git a/gfx/battle_anims/unused_battle_anims.pal b/gfx/battle_anims/unused_battle_anims.pal
new file mode 100644
index 000000000..4ef48dd0d
--- /dev/null
+++ b/gfx/battle_anims/unused_battle_anims.pal
@@ -0,0 +1,30 @@
+; gray
+	RGB 31, 31, 31
+	RGB 21, 21, 21
+	RGB 13, 13, 13
+	RGB 07, 07, 07
+; yellow
+	RGB 31, 31, 31
+	RGB 31, 31, 07
+	RGB 31, 16, 01
+	RGB 07, 07, 07
+; red
+	RGB 31, 31, 31
+	RGB 31, 19, 24
+	RGB 30, 10, 06
+	RGB 07, 07, 07
+; green
+	RGB 31, 31, 31
+	RGB 12, 25, 01
+	RGB 05, 14, 00
+	RGB 07, 07, 07
+; blue
+	RGB 31, 31, 31
+	RGB 08, 12, 31
+	RGB 01, 04, 31
+	RGB 07, 07, 07
+; brown
+	RGB 31, 31, 31
+	RGB 24, 18, 07
+	RGB 20, 15, 03
+	RGB 07, 07, 07
diff --git a/gfx/stats/party_menu_ob.pal b/gfx/stats/party_menu_ob.pal
index 70af517be..6acec536e 100644
--- a/gfx/stats/party_menu_ob.pal
+++ b/gfx/stats/party_menu_ob.pal
@@ -37,33 +37,3 @@
 	RGB 31, 19, 10
 	RGB 31, 07, 04
 	RGB 00, 00, 00
-
-	RGB 31, 31, 31
-	RGB 21, 21, 21
-	RGB 13, 13, 13
-	RGB 07, 07, 07
-
-	RGB 31, 31, 31
-	RGB 31, 31, 07
-	RGB 31, 16, 01
-	RGB 07, 07, 07
-
-	RGB 31, 31, 31
-	RGB 31, 19, 24
-	RGB 30, 10, 06
-	RGB 07, 07, 07
-
-	RGB 31, 31, 31
-	RGB 12, 25, 01
-	RGB 05, 14, 00
-	RGB 07, 07, 07
-
-	RGB 31, 31, 31
-	RGB 08, 12, 31
-	RGB 01, 04, 31
-	RGB 07, 07, 07
-
-	RGB 31, 31, 31
-	RGB 24, 18, 07
-	RGB 20, 15, 03
-	RGB 07, 07, 07
diff --git a/tools/free_space.py b/tools/free_space.py
new file mode 100644
index 000000000..4df8aec9d
--- /dev/null
+++ b/tools/free_space.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+Usage: python3 free_space.py [BANK=none] [pokecrystal.map]
+
+Calculate the free space in the ROM or its individual banks.
+
+The BANK argument allows printing free space in one, all, or none of the ROM's banks.
+Valid arguments are numbers (in decimal "42" or hexadecimal "0x2A"), "all" or "none".
+If not specified, defaults to "none".
+"""
+
+import sys
+
+from mapreader import MapReader
+
+def main():
+	print_bank = 'none'
+	mapfile = 'pokecrystal.map'
+
+	if len(sys.argv) >= 2 and sys.argv[1].startswith('BANK='):
+		print_bank = sys.argv[1].split('=', 1)[-1]
+		if len(sys.argv) >= 3:
+			mapfile = sys.argv[2]
+	elif len(sys.argv) >= 3 and sys.argv[2].startswith('BANK='):
+		print_bank = sys.argv[2].split('=', 1)[-1]
+		mapfile = sys.argv[1]
+
+	if print_bank not in {'all', 'none'}:
+		try:
+			if print_bank.startswith('0x') or print_bank.startswith('0X'):
+				print_bank = int(print_bank[2:], 16)
+			else:
+				print_bank = int(print_bank)
+		except ValueError:
+			error = 'Error: invalid BANK: %s' % print_bank
+			if print_bank.isalnum():
+				error += ' (did you mean: 0x%s?)' % print_bank
+			print(error, file=sys.stderr)
+			sys.exit(1)
+
+	num_banks = 0x80
+	bank_size = 0x4000 # bytes
+	total_size = num_banks * bank_size
+
+	r = MapReader()
+	with open(mapfile, 'r', encoding='utf-8') as f:
+		l = f.readlines()
+	r.read_map_data(l)
+
+	free_space = 0
+	per_bank = []
+	default_bank_data = {'sections': [], 'used': 0, 'slack': bank_size}
+	for bank in range(num_banks):
+		bank_data = r.bank_data['ROM0 bank'] if bank == 0 else r.bank_data['ROMX bank']
+		data = bank_data.get(bank, default_bank_data)
+		used = data['used']
+		slack = data['slack']
+		per_bank.append((used, slack))
+		free_space += slack
+
+	print('Free space: %d/%d (%.2f%%)' % (free_space, total_size, free_space * 100.0 / total_size))
+	if print_bank != 'none':
+		print()
+		print('bank, used, free')
+	for bank in range(num_banks):
+		used, slack = per_bank[bank]
+		if print_bank in {'all', bank}:
+				print('$%02X, %d, %d' % (bank, used, slack))
+
+if __name__ == '__main__':
+	main()