diff --git a/PKHeX.WinForms/Subforms/Save Editors/Gen7/SAV_Trainer7.Designer.cs b/PKHeX.WinForms/Subforms/Save Editors/Gen7/SAV_Trainer7.Designer.cs
index 1d02513da..f6452e16e 100644
--- a/PKHeX.WinForms/Subforms/Save Editors/Gen7/SAV_Trainer7.Designer.cs	
+++ b/PKHeX.WinForms/Subforms/Save Editors/Gen7/SAV_Trainer7.Designer.cs	
@@ -191,6 +191,7 @@ private void InitializeComponent()
             this.LB_BallThrowTypeLearned = new System.Windows.Forms.ListBox();
             this.L_Stamps = new System.Windows.Forms.Label();
             this.LB_Stamps = new System.Windows.Forms.ListBox();
+            this.CHK_UnlockMega = new System.Windows.Forms.CheckBox();
             this.TC_Editor.SuspendLayout();
             this.Tab_Overview.SuspendLayout();
             this.GB_Stats.SuspendLayout();
@@ -1648,6 +1649,7 @@ private void InitializeComponent()
             // 
             // Tab_Misc
             // 
+            this.Tab_Misc.Controls.Add(this.CHK_UnlockMega);
             this.Tab_Misc.Controls.Add(this.L_BallThrowType);
             this.Tab_Misc.Controls.Add(this.CB_BallThrowType);
             this.Tab_Misc.Controls.Add(this.CB_BallThrowTypeListMode);
@@ -1979,6 +1981,16 @@ private void InitializeComponent()
             this.LB_Stamps.Size = new System.Drawing.Size(159, 52);
             this.LB_Stamps.TabIndex = 71;
             // 
+            // CHK_UnlockMega
+            // 
+            this.CHK_UnlockMega.AutoSize = true;
+            this.CHK_UnlockMega.Location = new System.Drawing.Point(6, 256);
+            this.CHK_UnlockMega.Name = "CHK_UnlockMega";
+            this.CHK_UnlockMega.Size = new System.Drawing.Size(90, 17);
+            this.CHK_UnlockMega.TabIndex = 72;
+            this.CHK_UnlockMega.Text = "Unlock Mega";
+            this.CHK_UnlockMega.UseVisualStyleBackColor = true;
+            // 
             // SAV_Trainer7
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
@@ -2202,5 +2214,6 @@ private void InitializeComponent()
         private System.Windows.Forms.CheckBox CHK_UnlockSuperMulti;
         private System.Windows.Forms.CheckBox CHK_UnlockSuperDoubles;
         private System.Windows.Forms.CheckBox CHK_UnlockSuperSingles;
+        private System.Windows.Forms.CheckBox CHK_UnlockMega;
     }
 }
diff --git a/PKHeX.WinForms/Subforms/Save Editors/Gen7/SAV_Trainer7.cs b/PKHeX.WinForms/Subforms/Save Editors/Gen7/SAV_Trainer7.cs
index b22f18d7d..6177610d0 100644
--- a/PKHeX.WinForms/Subforms/Save Editors/Gen7/SAV_Trainer7.cs	
+++ b/PKHeX.WinForms/Subforms/Save Editors/Gen7/SAV_Trainer7.cs	
@@ -229,6 +229,8 @@ private void getTextBoxes()
             CHK_UnlockSuperSingles.Checked = (btsu & 1) != 0;
             CHK_UnlockSuperDoubles.Checked = (btsu & (1 << 1)) != 0;
             CHK_UnlockSuperMulti.Checked = (btsu & (1 << 2)) != 0;
+
+            CHK_UnlockMega.Checked = SAV.MegaUnlocked;
         }
         private void save()
         {
@@ -343,6 +345,8 @@ private void save()
             if (CHK_UnlockSuperDoubles.Checked) btsu |= (1 << 1);
             if (CHK_UnlockSuperMulti.Checked) btsu |= (1 << 2);
             SAV.BattleTreeSuperUnlocked = btsu;
+
+            SAV.MegaUnlocked = CHK_UnlockMega.Checked;
         }
 
         private void clickOT(object sender, MouseEventArgs e)
diff --git a/PKHeX/Saves/SAV7.cs b/PKHeX/Saves/SAV7.cs
index e401ab0ef..911a6d45b 100644
--- a/PKHeX/Saves/SAV7.cs
+++ b/PKHeX/Saves/SAV7.cs
@@ -1302,6 +1302,15 @@ public byte BattleTreeSuperUnlocked
             get { return (byte)(Data[0x23F9] >> 5); }
             set { Data[0x23F9] = (byte)((Data[0x23F9] & 0x1F) | ((value & 0x07) << 5)); }
         }
+        public bool MegaUnlocked
+        {
+            get { return (Data[0x1278] & 0x01) != 0; }
+            set
+            {
+                Data[0x1278] = (byte)((Data[0x1278] & 0xFE) | (value ? 1 : 0)); // in battle
+                // Data[0x1F22] = (byte)((Data[0x1F22] & 0xFE) | (value ? 1 : 0)); // event
+            }
+        }
 
         public override bool RequiresMemeCrypto => true;
     }