use "x + -1" not "x +- 1"

(TODO: use "x - 1" once rgbds allows it)

constants/deco_constants.asm

@@ -121,8 +121,7 @@ __enum__ = 0
 	deco  GEODUDE_DOLL
 	deco  MACHOP_DOLL
 	deco  TENTACOOL_DOLL
+NUM_NON_TROPHY_DECOS = __enum__
 	deco  GOLD_TROPHY_DOLL
 	deco  SILVER_TROPHY_DOLL
-
 NUM_DECOS = __enum__
-NUM_NON_TROPHY_DECOS = NUM_DECOS +- 2

constants/item_constants.asm

@@ -288,7 +288,7 @@ NUM_HMS = const_value - HM01
 	add_mt FLAMETHROWER
 	add_mt THUNDERBOLT
 	add_mt ICE_BEAM
-NUM_TM_HM_TUTOR = __enum__ +- 1
+NUM_TM_HM_TUTOR = __enum__ + -1
 
 USE_SCRIPT_VAR EQU $00
 ITEM_FROM_MEM  EQU $ff

constants/pokemon_constants.asm

@@ -271,7 +271,7 @@ JOHTO_POKEMON EQU const_value
 	const LUGIA      ; f9
 	const HO_OH      ; fa
 	const CELEBI     ; fb
-NUM_POKEMON EQU const_value +- 1
+NUM_POKEMON EQU const_value + -1
 	const MON_FC     ; fc
 	const EGG        ; fd
 	const MON_FE     ; fe
@@ -311,4 +311,4 @@ NUM_POKEMON EQU const_value +- 1
 	const UNOWN_X ; 24
 	const UNOWN_Y ; 25
 	const UNOWN_Z ; 26
-NUM_UNOWN EQU const_value +- 1 ; 26
+NUM_UNOWN EQU const_value + -1 ; 26

constants/pokemon_data_constants.asm

@@ -125,7 +125,7 @@ MONS_PER_BOX EQU 20
 NUM_BOXES    EQU 14
 
 ; hall of fame
-HOF_MON_LENGTH = 1 + 2 + 2 + 1 + (MON_NAME_LENGTH +- 1) ; species, id, dvs, level, nick
+HOF_MON_LENGTH = 1 + 2 + 2 + 1 + (MON_NAME_LENGTH + -1) ; species, id, dvs, level, nick
 HOF_LENGTH = 1 + HOF_MON_LENGTH * PARTY_LENGTH + 1 ; win count, party, terminator
 NUM_HOF_TEAMS = 30
 

constants/script_constants.asm

@@ -200,7 +200,7 @@ EMOTE_MEM EQU -1
 	const FRUITTREE_PEWTER_CITY_1 ; 1c
 	const FRUITTREE_PEWTER_CITY_2 ; 1d
 	const FRUITTREE_FUCHSIA_CITY  ; 1e
-NUM_FRUIT_TREES EQU const_value +- 1
+NUM_FRUIT_TREES EQU const_value + -1
 
 ; describedecoration arguments
 ; DescribeDecoration.JumpTable indexes (see engine/decorations.asm)