diff --git a/constants.asm b/constants.asm
index b3e3955c4..67e2145b2 100644
--- a/constants.asm
+++ b/constants.asm
@@ -1691,6 +1691,55 @@ HM_07         EQU $F9
 
 NUM_TMS EQU HM_01 - TM_01 - 2
 
+; pockets
+ITEM     EQU 1
+KEY_ITEM EQU 2
+BALL     EQU 3
+TM_HM    EQU 4
+
+; item actions
+CANT_SELECT EQU %01000000
+CANT_TOSS   EQU %10000000
+
+; held item effects
+HELD_BERRY          EQU $01
+HELD_LEFTOVERS      EQU $03
+HELD_RESTORE_PP     EQU $06
+HELD_CLEANSE_TAG    EQU $08
+HELD_HEAL_POISON    EQU $0a
+HELD_HEAL_FREEZE    EQU $0b
+HELD_HEAL_BURN      EQU $0c
+HELD_HEAL_SLEEP     EQU $0d
+HELD_HEAL_PARALYZE  EQU $0e
+HELD_HEAL_STATUS    EQU $0f
+HELD_HEAL_CONFUSION EQU $10
+HELD_METAL_POWDER   EQU $2a
+HELD_NORMAL_BOOST   EQU $32
+HELD_FIGHTING_BOOST EQU $33
+HELD_FLYING_BOOST   EQU $34
+HELD_POISON_BOOST   EQU $35
+HELD_GROUND_BOOST   EQU $36
+HELD_ROCK_BOOST     EQU $37
+HELD_BUG_BOOST      EQU $38
+HELD_GHOST_BOOST    EQU $39
+HELD_FIRE_BOOST     EQU $3a
+HELD_WATER_BOOST    EQU $3b
+HELD_GRASS_BOOST    EQU $3c
+HELD_ELECTRIC_BOOST EQU $3d
+HELD_PSYCHIC_BOOST  EQU $3e
+HELD_ICE_BOOST      EQU $3f
+HELD_DRAGON_BOOST   EQU $40
+HELD_DARK_BOOST     EQU $41
+HELD_STEEL_BOOST    EQU $42
+HELD_ESCAPE         EQU $48
+HELD_CRITICAL_UP    EQU $49
+HELD_QUICK_CLAW     EQU $4a
+HELD_TRADE_EVOLVE   EQU $4b
+HELD_AMULET_COIN    EQU $4c
+HELD_BRIGHTPOWDER   EQU $4d
+HELD_FOCUS_BAND     EQU $4f
+
+
 
 ; days of the week
 SUNDAY    EQU $00