diff --git a/src/battle_interface.c b/src/battle_interface.c
index 4a8422091..0eb494db4 100644
--- a/src/battle_interface.c
+++ b/src/battle_interface.c
@@ -1753,7 +1753,7 @@ static void sub_8073E08(u8 taskId)
         if (--gTasks[taskId].tData15 < 0)
             return;
 
-        SetGpuReg(REG_OFFSET_BLDALPHA, (gTasks[taskId].data[15]) | ((16 - gTasks[taskId].data[15]) << 8));
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(gTasks[taskId].data[15], 16 - gTasks[taskId].data[15]));
     }
     if (gTasks[taskId].tData15 == 0)
         gTasks[taskId].func = sub_8073E64;
@@ -1806,7 +1806,7 @@ static void sub_8073F98(u8 taskId)
 
     if (--gTasks[taskId].tData15 >= 0)
     {
-        SetGpuReg(REG_OFFSET_BLDALPHA, (gTasks[taskId].tData15) | ((16 - gTasks[taskId].tData15) << 8));
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(gTasks[taskId].data[15], 16 - gTasks[taskId].data[15]));
     }
     else if (gTasks[taskId].tData15 == -1)
     {
diff --git a/src/credits.c b/src/credits.c
index c27004a28..3639d36e4 100644
--- a/src/credits.c
+++ b/src/credits.c
@@ -2220,7 +2220,7 @@ static void sub_8177050(struct Sprite *sprite)
         else
         {
             SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_EFFECT_BLEND | BLDCNT_TGT2_BG0 | BLDCNT_TGT2_BG1 | BLDCNT_TGT2_BG2 | BLDCNT_TGT2_BG3);
-            SetGpuReg(REG_OFFSET_BLDALPHA, 0x10);
+            SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(16, 0));
             sprite->oam.objMode = 1;
             sprite->data[3] = 16;
             sprite->data[0] += 1;
diff --git a/src/evolution_scene.c b/src/evolution_scene.c
index 1b3133e9e..2c1df814b 100644
--- a/src/evolution_scene.c
+++ b/src/evolution_scene.c
@@ -1480,7 +1480,7 @@ static void InitMovingBackgroundTask(bool8 isLink)
     if (!isLink)
     {
         SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG1 | BLDCNT_EFFECT_BLEND | BLDCNT_TGT2_BG2);
-        SetGpuReg(REG_OFFSET_BLDALPHA, 0x808);
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(8, 8));
         SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_OBJ_ON | DISPCNT_BG2_ON | DISPCNT_BG1_ON | DISPCNT_BG0_ON | DISPCNT_OBJ_1D_MAP);
 
         SetBgAttribute(innerBgId, BG_ATTR_PRIORITY, 2);
@@ -1492,7 +1492,7 @@ static void InitMovingBackgroundTask(bool8 isLink)
     else
     {
         SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG1 | BLDCNT_EFFECT_BLEND | BLDCNT_TGT2_BG3);
-        SetGpuReg(REG_OFFSET_BLDALPHA, 0x808);
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(8, 8));
         SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_OBJ_ON | DISPCNT_BG3_ON | DISPCNT_BG1_ON | DISPCNT_BG0_ON | DISPCNT_OBJ_1D_MAP);
     }
 
diff --git a/src/hall_of_fame.c b/src/hall_of_fame.c
index 63818dd49..34d62149a 100644
--- a/src/hall_of_fame.c
+++ b/src/hall_of_fame.c
@@ -356,7 +356,7 @@ static bool8 InitHallOfFameScreen(void)
         break;
     case 2:
         SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG1 | BLDCNT_EFFECT_BLEND | BLDCNT_TGT2_ALL);
-        SetGpuReg(REG_OFFSET_BLDALPHA, 0x710);
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(16, 7));
         SetGpuReg(REG_OFFSET_BLDY, 0);
         sub_8174FAC();
         sHofGfxPtr->state = 0;
@@ -818,7 +818,7 @@ void CB2_DoHallOfFamePC(void)
             u8 taskId, i;
 
             SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG1 | BLDCNT_EFFECT_BLEND | BLDCNT_TGT2_ALL);
-            SetGpuReg(REG_OFFSET_BLDALPHA, 0x710);
+            SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(16, 7));
             SetGpuReg(REG_OFFSET_BLDY, 0);
             taskId = CreateTask(Task_HofPC_CopySaveData, 0);
 
diff --git a/src/mail.c b/src/mail.c
index 7b096ed00..287a91e65 100644
--- a/src/mail.c
+++ b/src/mail.c
@@ -89,7 +89,7 @@ struct MailGraphics
 
 struct MailRead
 {
-    /*0x0000*/ u8 strbuf[8][64];
+    /*0*/ u8 strbuf[8][64];
     /*0x0200*/ u8 playerName[12];
     /*0x020C*/ MainCallback callback;
     /*0x0210*/ MainCallback callback2;
@@ -170,29 +170,29 @@ static const u16 sUnknown_0859F2B0[][2] = {
 
 static const struct MailGraphics sUnknown_0859F2B8[] = {
     {
-        gMailPalette_Orange, gMailTiles_Orange, gMailTilemap_Orange, 0x02c0, 0x0000, 0x294a, 0x6739
+        gMailPalette_Orange, gMailTiles_Orange, gMailTilemap_Orange, 0x02c0, 0, 0x294a, 0x6739
     }, {
-        gMailPalette_Harbor, gMailTiles_Harbor, gMailTilemap_Harbor, 0x02e0, 0x0000, 0x7fff, 0x4631
+        gMailPalette_Harbor, gMailTiles_Harbor, gMailTilemap_Harbor, 0x02e0, 0, 0x7fff, 0x4631
     }, {
-        gMailPalette_Glitter, gMailTiles_Glitter, gMailTilemap_Glitter, 0x0400, 0x0000, 0x294a, 0x6739
+        gMailPalette_Glitter, gMailTiles_Glitter, gMailTilemap_Glitter, 0x0400, 0, 0x294a, 0x6739
     }, {
-        gMailPalette_Mech, gMailTiles_Mech, gMailTilemap_Mech, 0x01e0, 0x0000, 0x7fff, 0x4631
+        gMailPalette_Mech, gMailTiles_Mech, gMailTilemap_Mech, 0x01e0, 0, 0x7fff, 0x4631
     }, {
-        gMailPalette_Wood, gMailTiles_Wood, gMailTilemap_Wood, 0x02e0, 0x0000, 0x7fff, 0x4631
+        gMailPalette_Wood, gMailTiles_Wood, gMailTilemap_Wood, 0x02e0, 0, 0x7fff, 0x4631
     }, {
-        gMailPalette_Wave, gMailTiles_Wave, gMailTilemap_Wave, 0x0300, 0x0000, 0x294a, 0x6739
+        gMailPalette_Wave, gMailTiles_Wave, gMailTilemap_Wave, 0x0300, 0, 0x294a, 0x6739
     }, {
-        gMailPalette_Bead, gMailTiles_Bead, gMailTilemap_Bead, 0x0140, 0x0000, 0x7fff, 0x4631
+        gMailPalette_Bead, gMailTiles_Bead, gMailTilemap_Bead, 0x0140, 0, 0x7fff, 0x4631
     }, {
-        gMailPalette_Shadow, gMailTiles_Shadow, gMailTilemap_Shadow, 0x0300, 0x0000, 0x7fff, 0x4631
+        gMailPalette_Shadow, gMailTiles_Shadow, gMailTilemap_Shadow, 0x0300, 0, 0x7fff, 0x4631
     }, {
-        gMailPalette_Tropic, gMailTiles_Tropic, gMailTilemap_Tropic, 0x0220, 0x0000, 0x294a, 0x6739
+        gMailPalette_Tropic, gMailTiles_Tropic, gMailTilemap_Tropic, 0x0220, 0, 0x294a, 0x6739
     }, {
-        gMailPalette_Dream, gMailTiles_Dream, gMailTilemap_Dream, 0x0340, 0x0000, 0x294a, 0x6739
+        gMailPalette_Dream, gMailTiles_Dream, gMailTilemap_Dream, 0x0340, 0, 0x294a, 0x6739
     }, {
-        gMailPalette_Fab, gMailTiles_Fab, gMailTilemap_Fab, 0x02a0, 0x0000, 0x294a, 0x6739
+        gMailPalette_Fab, gMailTiles_Fab, gMailTilemap_Fab, 0x02a0, 0, 0x294a, 0x6739
     }, {
-        gMailPalette_Retro, gMailTiles_Retro, gMailTilemap_Retro, 0x0520, 0x0000, 0x294a, 0x6739
+        gMailPalette_Retro, gMailTiles_Retro, gMailTilemap_Retro, 0x0520, 0, 0x294a, 0x6739
     }
 };
 
@@ -306,7 +306,7 @@ static bool8 MailReadBuildGraphics(void)
         case 0:
             SetVBlankCallback(NULL);
             ScanlineEffect_Stop();
-            SetGpuReg(REG_OFFSET_DISPCNT, 0x0000);
+            SetGpuReg(REG_OFFSET_DISPCNT, 0);
             break;
         case 1:
             CpuFill16(0, (void *)OAM, OAM_SIZE);
@@ -323,16 +323,16 @@ static bool8 MailReadBuildGraphics(void)
         case 5:
             FreeAllSpritePalettes();
             reset_temp_tile_data_buffers();
-            SetGpuReg(REG_OFFSET_BG0HOFS, 0x0000);
-            SetGpuReg(REG_OFFSET_BG0VOFS, 0x0000);
-            SetGpuReg(REG_OFFSET_BG1HOFS, 0x0000);
-            SetGpuReg(REG_OFFSET_BG1VOFS, 0x0000);
-            SetGpuReg(REG_OFFSET_BG2VOFS, 0x0000);
-            SetGpuReg(REG_OFFSET_BG2HOFS, 0x0000);
-            SetGpuReg(REG_OFFSET_BG3HOFS, 0x0000);
-            SetGpuReg(REG_OFFSET_BG3VOFS, 0x0000);
-            SetGpuReg(REG_OFFSET_BLDCNT,  0x0000);
-            SetGpuReg(REG_OFFSET_BLDALPHA, 0x0000);
+            SetGpuReg(REG_OFFSET_BG0HOFS, 0);
+            SetGpuReg(REG_OFFSET_BG0VOFS, 0);
+            SetGpuReg(REG_OFFSET_BG1HOFS, 0);
+            SetGpuReg(REG_OFFSET_BG1VOFS, 0);
+            SetGpuReg(REG_OFFSET_BG2VOFS, 0);
+            SetGpuReg(REG_OFFSET_BG2HOFS, 0);
+            SetGpuReg(REG_OFFSET_BG3HOFS, 0);
+            SetGpuReg(REG_OFFSET_BG3VOFS, 0);
+            SetGpuReg(REG_OFFSET_BLDCNT,  0);
+            SetGpuReg(REG_OFFSET_BLDALPHA, 0);
             break;
         case 6:
             ResetBgsAndClearDma3BusyFlags(0);
diff --git a/src/rayquaza_scene.c b/src/rayquaza_scene.c
index 94d81e30f..00a73a0a2 100644
--- a/src/rayquaza_scene.c
+++ b/src/rayquaza_scene.c
@@ -1708,7 +1708,7 @@ static void sub_81D752C(u8 taskId)
     if (data[0] != 16)
     {
         data[0]++;
-        SetGpuReg(REG_OFFSET_BLDALPHA, (data[0] << 8) | (16 - data[0]));
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(16 - data[0], data[0]));
     }
 }
 
@@ -1954,7 +1954,7 @@ static void Task_RayTakesFlightAnim(u8 taskId)
     sub_81D7E10();
     sub_81D7E9C();
     SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_OBJ | BLDCNT_TGT2_BG1 | BLDCNT_EFFECT_BLEND);
-    SetGpuReg(REG_OFFSET_BLDALPHA, 0x808);
+    SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(8, 8));
     BlendPalettes(-1, 0x10, 0);
     SetVBlankCallback(VBlankCB_RayquazaScene);
     CreateTask(sub_81D81A4, 0);
@@ -2153,7 +2153,7 @@ static void Task_RayDescendsAnim(u8 taskId)
     sub_81D82B0();
     sub_81D8358();
     SetGpuRegBits(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG0 | BLDCNT_TGT2_BG1 | BLDCNT_TGT2_BG2 | BLDCNT_TGT2_BG3 | BLDCNT_TGT2_OBJ | BLDCNT_EFFECT_BLEND);
-    SetGpuReg(REG_OFFSET_BLDALPHA, 0x1000);
+    SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(0, 16));
     BlendPalettes(-1, 0x10, 0);
     SetVBlankCallback(VBlankCB_RayquazaScene);
     sRayScene->field_2008 = 0;
@@ -2509,7 +2509,7 @@ static void Task_RayChasesAwayAnim(u8 taskId)
     sub_81D68C8();
     ClearGpuRegBits(REG_OFFSET_DISPCNT, DISPCNT_BG2_ON);
     SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG0 | BLDCNT_TGT2_BG1 | BLDCNT_EFFECT_BLEND);
-    SetGpuReg(REG_OFFSET_BLDALPHA, 0xE09);
+    SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(9, 14));
     BlendPalettes(-1, 0x10, 0);
     SetVBlankCallback(VBlankCB_RayquazaScene);
     data[0] = 0;
diff --git a/src/title_screen.c b/src/title_screen.c
index 76704987f..48571ff96 100644
--- a/src/title_screen.c
+++ b/src/title_screen.c
@@ -616,7 +616,7 @@ static void Task_TitleScreenPhase1(u8 taskId)
         SetGpuReg(REG_OFFSET_WININ, 0);
         SetGpuReg(REG_OFFSET_WINOUT, 0);
         SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_OBJ | BLDCNT_EFFECT_BLEND | BLDCNT_TGT2_ALL);
-        SetGpuReg(REG_OFFSET_BLDALPHA, 0x10);
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(16, 0));
         SetGpuReg(REG_OFFSET_BLDY, 0);
 
         // Create left side of version banner
@@ -653,7 +653,7 @@ static void Task_TitleScreenPhase2(u8 taskId)
     {
         gTasks[taskId].tSkipToNext = TRUE;
         SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG1 | BLDCNT_EFFECT_BLEND | BLDCNT_TGT2_BG0 | BLDCNT_TGT2_BD);
-        SetGpuReg(REG_OFFSET_BLDALPHA, 0xF06);
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(6, 15));
         SetGpuReg(REG_OFFSET_BLDY, 0);
         SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_MODE_1
                                     | DISPCNT_OBJ_1D_MAP
diff --git a/src/unk_transition.c b/src/unk_transition.c
index 0faf45402..d56998b5b 100644
--- a/src/unk_transition.c
+++ b/src/unk_transition.c
@@ -338,7 +338,7 @@ static bool8 sub_81DAACC(struct Task *task)
     {
         sub_81DA700();
         SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG0 | BLDCNT_EFFECT_BLEND | BLDCNT_TGT2_ALL);
-        SetGpuReg(REG_OFFSET_BLDALPHA, 0x1000);
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(0, 16));
         ChangeBgX(0, 0, 0);
         ChangeBgY(0, 0, 0);
         ChangeBgY(0, 0x500, 2);
@@ -368,11 +368,11 @@ static bool8 sub_81DAB4C(struct Task *task)
     }
     else
     {
-        u16 var;
+        u16 blnd;
 
         task->data[2]++;
-        var = task->data[2];
-        SetGpuReg(REG_OFFSET_BLDALPHA, (var) | ((16 - var) << 8));
+        blnd = task->data[2];
+        SetGpuReg(REG_OFFSET_BLDALPHA, BLDALPHA_BLEND(blnd, 16 - blnd));
     }
 
     return FALSE;