diff --git a/data/battle_tower.asm b/data/battle_tower.asm
index e10a47a96..f6d7b95de 100644
--- a/data/battle_tower.asm
+++ b/data/battle_tower.asm
@@ -3,15 +3,22 @@ Function_LoadOpponentTrainerAndPokemons: ; 1f8000
 	push af
 	ld a, $3
 	ld [rSVBK], a
+	
+	; Fill BT_OTrainer with zeros
 	xor a
-	ld hl, w3_d100
-	ld bc, $00e0
+	ld hl, BT_OTrainer
+	ld bc, BT_OTrainerEnd - BT_OTrainer
 	call ByteFill
+	
+	; Write $ff into the Item-Slots
 	ld a, $ff
-	ld [w3_d100 + $0c], a
-	ld [w3_d100 + $47], a
-	ld [w3_d100 + $82], a
-	ld de, w3_d100
+	ld [BT_OTPkmn1Item], a
+	ld [BT_OTPkmn2Item], a
+	ld [BT_OTPkmn3Item], a
+	
+	; Set BT_OTTrainer as start address to write the following data to
+	ld de, BT_OTrainer
+
 	ld a, [hRandomAdd]
 	ld b, a
 .asm_1f8022 ; loop to find a random trainer
@@ -110,22 +117,22 @@ Function_LoadRandomBattleTowerPkmn: ; 1f8081
 	ld b, a
 	ld a, [hld]
 	ld c, a
-	ld a, [w3_d100 + $0b]
+	ld a, [BT_OTPkmn1]
 	cp b
 	jr z, .FindARandomBattleTowerPkmn
-	ld a, [w3_d100 + $0c]
+	ld a, [BT_OTPkmn1Item]
 	cp c
 	jr z, .FindARandomBattleTowerPkmn
-	ld a, [w3_d100 + $46]
+	ld a, [BT_OTPkmn2]
 	cp b
 	jr z, .FindARandomBattleTowerPkmn
-	ld a, [w3_d100 + $47]
+	ld a, [BT_OTPkmn2Item]
 	cp c
 	jr z, .FindARandomBattleTowerPkmn
-	ld a, [w3_d100 + $81]
+	ld a, [BT_OTPkmn3]
 	cp b
 	jr z, .FindARandomBattleTowerPkmn
-	ld a, [w3_d100 + $82]
+	ld a, [BT_OTPkmn3Item]
 	cp c
 	jr z, .FindARandomBattleTowerPkmn
 	ld a, [sBTPkmnPrevTrainer1]
@@ -178,11 +185,11 @@ Function_LoadRandomBattleTowerPkmn: ; 1f8081
 	ld [sBTPkmnPrevPrevTrainer2], a
 	ld a, [sBTPkmnPrevTrainer3]
 	ld [sBTPkmnPrevPrevTrainer3], a
-	ld a, [w3_d100 + $0b]
+	ld a, [BT_OTPkmn1]
 	ld [sBTPkmnPrevTrainer1], a
-	ld a, [w3_d100 + $46]
+	ld a, [BT_OTPkmn2]
 	ld [sBTPkmnPrevTrainer2], a
-	ld a, [w3_d100 + $81]
+	ld a, [BT_OTPkmn3]
 	ld [sBTPkmnPrevTrainer3], a
 	call CloseSRAM
 	ret
diff --git a/misc/mobile_45.asm b/misc/mobile_45.asm
index ff04cb52f..d3da66d5c 100644
--- a/misc/mobile_45.asm
+++ b/misc/mobile_45.asm
@@ -23170,9 +23170,9 @@ Function1704a2: ; 1704a2
 	push af
 	ld a, $3
 	ld [rSVBK], a
-	ld hl, LYOverrides
+	ld hl, $d100 ; this is NOT LYOverrides
 	ld de, $c608
-	ld bc, $00e0
+	ld bc, BT_OTrainerEnd - BT_OTrainer
 	call CopyBytes
 	pop af
 	ld [rSVBK], a
diff --git a/wram.asm b/wram.asm
index 82294c9da..0cfc81988 100644
--- a/wram.asm
+++ b/wram.asm
@@ -2600,22 +2600,25 @@ SECTION "WRAM 3", WRAMX, BANK [3]
 
 	ds $100
 
+BT_OTrainer::
 w3_d100:: ; BattleTower OpponentTrainer-Data (lengt = 0xe0)
 	ds $6
-BT_OTTrainerPkmn1:: ; w3_d10b
+	ds $5
+BT_OTPkmn1:: ; w3_d10b
 	ds $1
-BT_OTTrainerPkmn1Item::
+BT_OTPkmn1Item::
 	ds $3b-1
-BT_OTTrainerPkmn2:: ; w3_d146
+BT_OTPkmn2:: ; w3_d146
 	ds $1
-BT_OTTrainerPkmn2Item::
+BT_OTPkmn2Item::
 	ds $3b-1
-BT_OTTrainerPkmn3:: ; w3_d181
+BT_OTPkmn3:: ; w3_d181
 	ds $1
-BT_OTTrainerPkmn3Item::
+BT_OTPkmn3Item::
 	ds $3b-1
 	
-	ds $29
+	ds $24
+BT_OTrainerEnd::
 	
 	ds $620