diff --git a/PKHeX.Core/Editing/Saves/Slots/Extensions.cs b/PKHeX.Core/Editing/Saves/Slots/Extensions.cs
index 46f463005..39b98d55e 100644
--- a/PKHeX.Core/Editing/Saves/Slots/Extensions.cs
+++ b/PKHeX.Core/Editing/Saves/Slots/Extensions.cs
@@ -228,7 +228,11 @@ private static List<SlotInfoMisc> GetExtraSlots8a(SAV8LA _)
 
     private static List<SlotInfoMisc> GetExtraSlots9(SAV9SV sav)
     {
-        var list = new List<SlotInfoMisc>();
+        var list = new List<SlotInfoMisc>
+        {
+            new(sav.BoxInfo.Data, 0, sav.GetBoxOffset(BoxLayout9.BoxCount), true, Mutable: true) { Type = StorageSlotType.Party },
+        };
+
         var block = sav.Blocks.GetBlockSafe(SaveBlockAccessor9SV.KFusedCalyrex);
         var c = new SlotInfoMisc(block.Data, 3, 0, true) { Type = StorageSlotType.Fused };
         list.Add(c);
diff --git a/PKHeX.Core/Editing/Saves/Slots/Info/SlotInfoMisc.cs b/PKHeX.Core/Editing/Saves/Slots/Info/SlotInfoMisc.cs
index 144059b1c..2e579ed6f 100644
--- a/PKHeX.Core/Editing/Saves/Slots/Info/SlotInfoMisc.cs
+++ b/PKHeX.Core/Editing/Saves/Slots/Info/SlotInfoMisc.cs
@@ -3,11 +3,11 @@ namespace PKHeX.Core;
 /// <summary>
 /// Miscellaneous origination <see cref="ISlotInfo"/>
 /// </summary>
-public sealed record SlotInfoMisc(byte[] Data, int Slot, int Offset, bool PartyFormat = false) : ISlotInfo
+public sealed record SlotInfoMisc(byte[] Data, int Slot, int Offset, bool PartyFormat = false, bool Mutable = false) : ISlotInfo
 {
     public SlotOrigin Origin => PartyFormat ? SlotOrigin.Party : SlotOrigin.Box;
-    public bool CanWriteTo(SaveFile sav) => false;
-    public WriteBlockedMessage CanWriteTo(SaveFile sav, PKM pk) => WriteBlockedMessage.InvalidDestination;
+    public bool CanWriteTo(SaveFile sav) => Mutable;
+    public WriteBlockedMessage CanWriteTo(SaveFile sav, PKM pk) => Mutable ? WriteBlockedMessage.None : WriteBlockedMessage.InvalidDestination;
     public StorageSlotType Type { get; init; }
 
     public SlotInfoMisc(SaveFile sav, int slot, int offset, bool party = false) : this(GetBuffer(sav), slot, offset, party) { }
diff --git a/PKHeX.Core/Saves/SAV9SV.cs b/PKHeX.Core/Saves/SAV9SV.cs
index bf0ac2509..4bf3e7276 100644
--- a/PKHeX.Core/Saves/SAV9SV.cs
+++ b/PKHeX.Core/Saves/SAV9SV.cs
@@ -276,6 +276,12 @@ public override void SetBoxWallpaper(int box, int value)
         b.Data[box] = (byte)value;
     }
 
+    public byte BoxLegendWallpaperFlag
+    {
+        get => Blocks.GetBlock(SaveBlockAccessor9SV.KBoxWallpapers).Data[BoxLayout9.BoxCount];
+        set => Blocks.GetBlock(SaveBlockAccessor9SV.KBoxWallpapers).Data[BoxLayout9.BoxCount] = value;
+    }
+
     public void CollectAllStakes()
     {
         for (int i = 14; i <= 17; i++)