From fda815c3e580846f3a9b741455c7d324e4969bbb Mon Sep 17 00:00:00 2001
From: Samuel Magnan <rainingchain@gmail.com>
Date: Sat, 28 Oct 2023 00:09:15 -0400
Subject: [PATCH] Gen2: Add MysteryGiftIsUnlocked flag in Simple Editor (#4007)

The flag indicates whether the option "Mystery Gift" has been unlocked and it is displayed in the start menu.
Note: It is unlocked after talking with the little girl on the fifth floor of the Goldenrod Department Store.
---
 PKHeX.Core/Saves/SAV2.cs                      | 20 +++++++++++++++++++
 .../Saves/Substructures/Gen12/SAV2Offsets.cs  |  4 ++++
 2 files changed, 24 insertions(+)

diff --git a/PKHeX.Core/Saves/SAV2.cs b/PKHeX.Core/Saves/SAV2.cs
index 7d9f6462e..efa044f21 100644
--- a/PKHeX.Core/Saves/SAV2.cs
+++ b/PKHeX.Core/Saves/SAV2.cs
@@ -507,6 +507,26 @@ public sealed class SAV2 : SaveFile, ILangDeviantSave, IEventFlagArray, IEventWo
         }
     }
 
+    public bool MysteryGiftIsUnlocked
+    {
+        get
+        {
+            int ofs = Offsets.MysteryGiftIsUnlocked;
+            if (ofs == -1)
+                return false;
+            return Data[ofs] == 0x00;
+        }
+        set
+        {
+            int ofs = Offsets.MysteryGiftIsUnlocked;
+            if (ofs == -1)
+                return;
+
+            Data[ofs] = (byte)(value ? 0x00 : 0xFF);
+            Data[ofs + 2] = Data[ofs];
+        }
+    }
+
     public override IReadOnlyList<InventoryPouch> Inventory
     {
         get
diff --git a/PKHeX.Core/Saves/Substructures/Gen12/SAV2Offsets.cs b/PKHeX.Core/Saves/Substructures/Gen12/SAV2Offsets.cs
index 270ab2599..b136c463a 100644
--- a/PKHeX.Core/Saves/Substructures/Gen12/SAV2Offsets.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen12/SAV2Offsets.cs
@@ -46,6 +46,7 @@ internal sealed class SAV2Offsets
     public int Daycare { get; }
 
     public int BlueCardPoints { get; private set; } = -1;
+    public int MysteryGiftIsUnlocked { get; private set; } = -1;
 
     public int PouchTMHM { get; private set; } = -1;
     public int PouchItem { get; private set; } = -1;
@@ -60,6 +61,8 @@ internal sealed class SAV2Offsets
         Rival = 0x2021;
         DaylightSavings = 0x2042;
         OtherCurrentBox = 0x284C;
+        MysteryGiftIsUnlocked = 0xBE3; // And 0xBE5;
+
         switch (version)
         {
             case GameVersion.GS:
@@ -125,6 +128,7 @@ internal sealed class SAV2Offsets
         Palette = 0x204C;
         CurrentBox = 0x2D10;
         OtherCurrentBox = 0x2842;
+        MysteryGiftIsUnlocked = 0xB51; // And 0xB53;
 
         switch (version)
         {