diff --git a/include/constants/metatile_behaviors.h b/include/constants/metatile_behaviors.h
index 5f37713f3..1c3d33c00 100755
--- a/include/constants/metatile_behaviors.h
+++ b/include/constants/metatile_behaviors.h
@@ -179,8 +179,8 @@
 #define MB_UNUSED_AF 0xAF
 #define MB_SECRET_BASE_PC 0xB0
 #define MB_SECRET_BASE_REGISTER_PC 0xB1
-#define MB_SECRET_BASE_UNUSED 0xB2
-#define MB_BLOCK_DECORATION 0xB3
+#define MB_SECRET_BASE_OBSTACLE 0xB2
+#define MB_SECRET_BASE_TRAINER_SPOT 0xB3
 #define MB_SECRET_BASE_DECORATION 0xB4
 #define MB_HOLDS_SMALL_DECORATION 0xB5
 #define MB_UNUSED_B6 0xB6
diff --git a/include/metatile_behavior.h b/include/metatile_behavior.h
index 5895426cf..c2d0d23ee 100644
--- a/include/metatile_behavior.h
+++ b/include/metatile_behavior.h
@@ -57,7 +57,7 @@ bool8 MetatileBehavior_IsSecretBaseTree(u8);
 bool8 MetatileBehavior_IsSecretBaseShrub(u8);
 bool8 MetatileBehavior_IsSecretBasePC(u8);
 bool8 MetatileBehavior_IsRecordMixingSecretBasePC(u8);
-bool8 MetatileBehavior_IsBlockDecoration(u8);
+bool8 MetatileBehavior_IsSecretBaseTrainerSpot(u8);
 bool8 MetatileBehavior_IsSecretBaseImpassable(u8);
 bool8 MetatileBehavior_IsSecretBaseDecorationBase(u8);
 bool8 MetatileBehavior_IsSecretBasePoster(u8);
diff --git a/src/decoration.c b/src/decoration.c
index 825c86818..0448778c3 100644
--- a/src/decoration.c
+++ b/src/decoration.c
@@ -1211,7 +1211,8 @@ static void ShowDecorationOnMap_(u16 mapX, u16 mapY, u8 decWidth, u8 decHeight,
         {
             x = mapX + i;
             attributes = GetMetatileAttributesById(NUM_TILES_IN_PRIMARY + gDecorations[decoration].tiles[j * decWidth + i]);
-            if (MetatileBehavior_IsSecretBaseImpassable(attributes) == TRUE || (gDecorations[decoration].permission != DECORPERM_PASS_FLOOR && (attributes >> METATILE_ATTR_LAYER_SHIFT)))
+            if (MetatileBehavior_IsSecretBaseImpassable(attributes & METATILE_ATTR_BEHAVIOR_MASK) == TRUE 
+             || (gDecorations[decoration].permission != DECORPERM_PASS_FLOOR && (attributes >> METATILE_ATTR_LAYER_SHIFT) != METATILE_LAYER_TYPE_NORMAL))
                 impassableFlag = MAPGRID_COLLISION_MASK;
             else
                 impassableFlag = 0;
@@ -1471,23 +1472,26 @@ static void AttemptCancelPlaceDecoration(u8 taskId)
     DisplayItemMessageOnField(taskId, gStringVar4, CancelDecoratingPrompt);
 }
 
-static bool8 IsNonBlockNonElevated(u8 behaviorAt, u16 layerType)
+static bool8 IsSecretBaseTrainerSpot(u8 behaviorAt, u16 layerType)
 {
-    if (MetatileBehavior_IsBlockDecoration(behaviorAt) != TRUE || layerType != 0)
+    if (!(MetatileBehavior_IsSecretBaseTrainerSpot(behaviorAt) == TRUE && layerType == METATILE_LAYER_TYPE_NORMAL))
         return FALSE;
     return TRUE;
 }
 
+// Can't place decoration where the player was standing when they interacted with the PC
 static bool8 IsntInitialPosition(u8 taskId, s16 x, s16 y, u16 layerType)
 {
-    if (x == gTasks[taskId].tInitialX + MAP_OFFSET && y == gTasks[taskId].tInitialY + MAP_OFFSET && layerType != 0)
+    if (x == gTasks[taskId].tInitialX + MAP_OFFSET 
+     && y == gTasks[taskId].tInitialY + MAP_OFFSET
+     && layerType != METATILE_LAYER_TYPE_NORMAL)
         return FALSE;
     return TRUE;
 }
 
 static bool8 IsFloorOrBoardAndHole(u16 behaviorAt, const struct Decoration *decoration)
 {
-    if (MetatileBehavior_IsBlockDecoration(behaviorAt) != TRUE)
+    if (MetatileBehavior_IsSecretBaseTrainerSpot(behaviorAt) != TRUE)
     {
         if (decoration->id == DECOR_SOLID_BOARD && MetatileBehavior_IsSecretBaseHole(behaviorAt) == TRUE)
             return TRUE;
@@ -1545,7 +1549,7 @@ static bool8 CanPlaceDecoration(u8 taskId, const struct Decoration *decoration)
                 curX = gTasks[taskId].tCursorX + j;
                 behaviorAt = MapGridGetMetatileBehaviorAt(curX, curY);
                 layerType = GetMetatileAttributesById(NUM_TILES_IN_PRIMARY + decoration->tiles[(mapY - 1 - i) * mapX + j]) & METATILE_ATTR_LAYER_MASK;
-                if (!MetatileBehavior_IsNormal(behaviorAt) && !IsNonBlockNonElevated(behaviorAt, layerType))
+                if (!MetatileBehavior_IsNormal(behaviorAt) && !IsSecretBaseTrainerSpot(behaviorAt, layerType))
                     return FALSE;
 
                 if (!IsntInitialPosition(taskId, curX, curY, layerType))
diff --git a/src/metatile_behavior.c b/src/metatile_behavior.c
index 6b58e3f05..452e68cff 100644
--- a/src/metatile_behavior.c
+++ b/src/metatile_behavior.c
@@ -188,8 +188,8 @@ static const u8 sTileBitAttributes[] =
     [MB_UNUSED_AF] = TILE_ATTRIBUTES(FALSE, FALSE, FALSE),
     [MB_SECRET_BASE_PC] = TILE_ATTRIBUTES(FALSE, FALSE, FALSE),
     [MB_SECRET_BASE_REGISTER_PC] = TILE_ATTRIBUTES(FALSE, FALSE, FALSE),
-    [MB_SECRET_BASE_UNUSED] = TILE_ATTRIBUTES(TRUE, FALSE, FALSE),
-    [MB_BLOCK_DECORATION] = TILE_ATTRIBUTES(TRUE, FALSE, FALSE),
+    [MB_SECRET_BASE_OBSTACLE] = TILE_ATTRIBUTES(TRUE, FALSE, FALSE),
+    [MB_SECRET_BASE_TRAINER_SPOT] = TILE_ATTRIBUTES(TRUE, FALSE, FALSE),
     [MB_SECRET_BASE_DECORATION] = TILE_ATTRIBUTES(FALSE, FALSE, FALSE),
     [MB_HOLDS_SMALL_DECORATION] = TILE_ATTRIBUTES(TRUE, FALSE, FALSE),
     [MB_UNUSED_B6] = TILE_ATTRIBUTES(FALSE, FALSE, FALSE),
@@ -687,17 +687,19 @@ bool8 MetatileBehavior_IsRecordMixingSecretBasePC(u8 metatileBehavior)
         return FALSE;
 }
 
-bool8 Unref_MetatileBehavior_IsSecretBaseUnused_B2(u8 metatileBehavior)
+// Used by the rock/grass floor spaces that the secret base trainer is not standing on
+bool8 MetatileBehavior_IsSecretBaseObstacle1(u8 metatileBehavior)
 {
-    if (metatileBehavior == MB_SECRET_BASE_UNUSED)
+    if (metatileBehavior == MB_SECRET_BASE_OBSTACLE)
         return TRUE;
     else
         return FALSE;
 }
 
-bool8 MetatileBehavior_IsBlockDecoration(u8 metatileBehavior)
+// Used by the rock/grass floor space that the secret base trainer stands on
+bool8 MetatileBehavior_IsSecretBaseTrainerSpot(u8 metatileBehavior)
 {
-    if (metatileBehavior == MB_BLOCK_DECORATION)
+    if (metatileBehavior == MB_SECRET_BASE_TRAINER_SPOT)
         return TRUE;
     else
         return FALSE;
@@ -743,9 +745,9 @@ bool8 MetatileBehavior_IsSecretBaseNorthWall(u8 metatileBehavior)
         return FALSE;
 }
 
-bool8 Unref_MetatileBehavior_IsSecretBaseUnused_B2_2(u8 metatileBehavior)
+bool8 MetatileBehavior_IsSecretBaseObstacle2(u8 metatileBehavior)
 {
-    if (metatileBehavior == MB_SECRET_BASE_UNUSED)
+    if (metatileBehavior == MB_SECRET_BASE_OBSTACLE)
         return TRUE;
     else
         return FALSE;