diff --git a/PKHeX.WinForms/Subforms/Save Editors/Gen4/SAV_Pokedex4.Designer.cs b/PKHeX.WinForms/Subforms/Save Editors/Gen4/SAV_Pokedex4.Designer.cs
index 99f49ef0e..a201d2d4d 100644
--- a/PKHeX.WinForms/Subforms/Save Editors/Gen4/SAV_Pokedex4.Designer.cs	
+++ b/PKHeX.WinForms/Subforms/Save Editors/Gen4/SAV_Pokedex4.Designer.cs	
@@ -51,6 +51,7 @@
             this.mnuCaughtNone = new System.Windows.Forms.ToolStripMenuItem();
             this.mnuCaughtAll = new System.Windows.Forms.ToolStripMenuItem();
             this.mnuComplete = new System.Windows.Forms.ToolStripMenuItem();
+            this.mnuUpgraded = new System.Windows.Forms.ToolStripMenuItem();
             this.CHK_Seen = new System.Windows.Forms.CheckBox();
             this.LB_Gender = new System.Windows.Forms.ListBox();
             this.B_GUp = new System.Windows.Forms.Button();
@@ -241,7 +242,8 @@
             this.mnuSeenAll,
             this.mnuCaughtNone,
             this.mnuCaughtAll,
-            this.mnuComplete});
+            this.mnuComplete,
+            this.mnuUpgraded});
             this.modifyMenu.Name = "modifyMenu";
             this.modifyMenu.Size = new System.Drawing.Size(149, 114);
             // 
@@ -280,6 +282,14 @@
             this.mnuComplete.Text = "Complete Dex";
             this.mnuComplete.Click += new System.EventHandler(this.modifyAll);
             // 
+            // mnuUpgraded
+            // 
+            this.mnuUpgraded.CheckOnClick = true;
+            this.mnuUpgraded.Name = "mnuUpgraded";
+            this.mnuUpgraded.Size = new System.Drawing.Size(148, 22);
+            this.mnuUpgraded.Text = "National Dex";
+            this.mnuUpgraded.Click += new System.EventHandler(this.mnuUpgraded_Click);
+            // 
             // CHK_Seen
             // 
             this.CHK_Seen.AutoSize = true;
@@ -488,6 +498,7 @@
         private System.Windows.Forms.ToolStripMenuItem mnuCaughtNone;
         private System.Windows.Forms.ToolStripMenuItem mnuCaughtAll;
         private System.Windows.Forms.ToolStripMenuItem mnuComplete;
+        private System.Windows.Forms.ToolStripMenuItem mnuUpgraded;
         private System.Windows.Forms.CheckBox CHK_Seen;
         private System.Windows.Forms.ListBox LB_Gender;
         private System.Windows.Forms.Button B_GUp;
@@ -504,4 +515,4 @@
         private System.Windows.Forms.Label L_Seen;
         private System.Windows.Forms.Label L_NotSeen;
     }
-}
\ No newline at end of file
+}
diff --git a/PKHeX.WinForms/Subforms/Save Editors/Gen4/SAV_Pokedex4.cs b/PKHeX.WinForms/Subforms/Save Editors/Gen4/SAV_Pokedex4.cs
index 6f72b337b..239911639 100644
--- a/PKHeX.WinForms/Subforms/Save Editors/Gen4/SAV_Pokedex4.cs	
+++ b/PKHeX.WinForms/Subforms/Save Editors/Gen4/SAV_Pokedex4.cs	
@@ -27,6 +27,8 @@ namespace PKHeX.WinForms
             for (int i = 1; i < SAV.MaxSpeciesID + 1; i++)
                 LB_Species.Items.Add(i.ToString("000") + " - " + GameInfo.Strings.specieslist[i]);
             
+            mnuUpgraded.Checked = SAV.DexUpgraded;
+            
             editing = false;
             LB_Species.SelectedIndex = 0;
         }
@@ -426,5 +428,10 @@ namespace PKHeX.WinForms
             lb.Items.Insert(newIndex, item);
             lb.SelectedIndex = newIndex;
         }
+        private void mnuUpgraded_Click(object sender, EventArgs e)
+        {
+            SAV.DexUpgraded ^= true;
+            mnuUpgraded.Checked = SAV.DexUpgraded;
+        }
     }
 }
diff --git a/PKHeX/Saves/SAV4.cs b/PKHeX/Saves/SAV4.cs
index 0f76e50e5..808f36c21 100644
--- a/PKHeX/Saves/SAV4.cs
+++ b/PKHeX/Saves/SAV4.cs
@@ -1020,5 +1020,10 @@ namespace PKHeX.Core
             Forms[n1] = FormNum;
             return true;
         }
+        public bool DexUpgraded
+        {
+            get{ return (Data[0x1415 + GBO] & 1) != 0; }
+            set{ Data[0x1415 + GBO] = (byte)((Data[0x1415 + GBO] & 0xFE) | (value ? 1 : 0)); }
+        }
     }
 }