Add GS Ball manual enable button

Adds a "misc" editor for Gen2 saves (only crystal for now), with a single button to enable the event (button enabled if the event is not yet enabled, lol)

746a06f1de/engine/menus/save.asm (L164-L175)

Closes #4335

PKHeX.Core/Saves/SAV2.cs

@@ -825,6 +825,25 @@ public sealed class SAV2 : SaveFile, ILangDeviantSave, IEventFlagArray, IEventWo
             Data[0x9000] = (byte)(0xFF - value);
         }
     }
+
+    private const byte GS_BALL_AVAILABLE = 0x0B;
+
+    /// <summary>
+    /// Triggered on Virtual Console by adding Hall of Fame entry, enabling the event.
+    /// </summary>
+    public void EnableGSBallMobileEvent()
+    {
+        if (Version is not GameVersion.C)
+            return;
+
+        // Write to the Crystal region of savedata
+        var primary = Japanese ? 0xA000 : 0x3E3C;
+        var backup = Japanese ? 0xA083 : 0x3E44;
+
+        Data[primary] = Data[backup] = GS_BALL_AVAILABLE;
+    }
+
+    public bool IsEnabledGSBallMobileEvent => Data[Japanese ? 0xA000 : 0x3E3C] == GS_BALL_AVAILABLE;
 }
 
 public enum GBMobileCableColor : byte

PKHeX.WinForms/Controls/SAV Editor/SAVEditor.cs

@@ -774,6 +774,7 @@ public partial class SAVEditor : UserControl, ISlotViewer<PictureBox>, ISaveFile
     {
         using var form = SAV switch
         {
+            SAV2 sav2 => new SAV_Misc2(sav2),
             SAV3 sav3 => new SAV_Misc3(sav3),
             SAV4 sav4 => new SAV_Misc4(sav4),
             SAV5 sav5 => new SAV_Misc5(sav5),
@@ -1217,7 +1218,7 @@ public partial class SAVEditor : UserControl, ISlotViewer<PictureBox>, ISaveFile
 
         B_OtherSlots.Visible = sav is SAV1StadiumJ or SAV1Stadium or SAV2Stadium;
         B_OpenTrainerInfo.Visible = B_OpenItemPouch.Visible = (sav.HasParty && SAV is not SAV4BR) || SAV is SAV7b; // Box RS & Battle Revolution
-        B_OpenMiscEditor.Visible = sav is SAV3 or SAV4 or SAV5 or SAV8BS;
+        B_OpenMiscEditor.Visible = sav is SAV2 { Version: GameVersion.C} or SAV3 or SAV4 or SAV5 or SAV8BS;
         B_Roamer.Visible = sav is SAV3 or SAV6XY;
 
         B_OpenHoneyTreeEditor.Visible = sav is SAV4Sinnoh;

PKHeX.WinForms/Subforms/Save Editors/Gen2/SAV_Misc2.Designer.cs

@@ -0,0 +1,93 @@
+namespace PKHeX.WinForms
+{
+    partial class SAV_Misc2
+    {
+        /// <summary>
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            B_Save = new System.Windows.Forms.Button();
+            B_Cancel = new System.Windows.Forms.Button();
+            B_VirtualConsoleGSBall = new System.Windows.Forms.Button();
+            SuspendLayout();
+            // 
+            // B_Save
+            // 
+            B_Save.Anchor = System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right;
+            B_Save.Location = new System.Drawing.Point(248, 220);
+            B_Save.Margin = new System.Windows.Forms.Padding(4, 3, 4, 3);
+            B_Save.Name = "B_Save";
+            B_Save.Size = new System.Drawing.Size(88, 27);
+            B_Save.TabIndex = 73;
+            B_Save.Text = "Save";
+            B_Save.UseVisualStyleBackColor = true;
+            B_Save.Click += B_Save_Click;
+            // 
+            // B_Cancel
+            // 
+            B_Cancel.Anchor = System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right;
+            B_Cancel.Location = new System.Drawing.Point(154, 220);
+            B_Cancel.Margin = new System.Windows.Forms.Padding(4, 3, 4, 3);
+            B_Cancel.Name = "B_Cancel";
+            B_Cancel.Size = new System.Drawing.Size(88, 27);
+            B_Cancel.TabIndex = 72;
+            B_Cancel.Text = "Cancel";
+            B_Cancel.UseVisualStyleBackColor = true;
+            B_Cancel.Click += B_Cancel_Click;
+            // 
+            // B_VirtualConsoleGSBall
+            // 
+            B_VirtualConsoleGSBall.Location = new System.Drawing.Point(12, 12);
+            B_VirtualConsoleGSBall.Name = "B_VirtualConsoleGSBall";
+            B_VirtualConsoleGSBall.Size = new System.Drawing.Size(160, 64);
+            B_VirtualConsoleGSBall.TabIndex = 74;
+            B_VirtualConsoleGSBall.Text = "Enable GS Ball Event (Virtual Console)";
+            B_VirtualConsoleGSBall.UseVisualStyleBackColor = true;
+            B_VirtualConsoleGSBall.Click += B_VirtualConsoleGSBall_Click;
+            // 
+            // SAV_Misc2
+            // 
+            AutoScaleMode = System.Windows.Forms.AutoScaleMode.Inherit;
+            ClientSize = new System.Drawing.Size(344, 261);
+            Controls.Add(B_VirtualConsoleGSBall);
+            Controls.Add(B_Save);
+            Controls.Add(B_Cancel);
+            FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
+            Icon = Properties.Resources.Icon;
+            Margin = new System.Windows.Forms.Padding(4, 3, 4, 3);
+            MaximizeBox = false;
+            MinimumSize = new System.Drawing.Size(231, 167);
+            Name = "SAV_Misc2";
+            StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
+            Text = "Misc Editor";
+            ResumeLayout(false);
+        }
+
+        #endregion
+        private System.Windows.Forms.Button B_Save;
+        private System.Windows.Forms.Button B_Cancel;
+        private System.Windows.Forms.Button B_VirtualConsoleGSBall;
+    }
+}

PKHeX.WinForms/Subforms/Save Editors/Gen2/SAV_Misc2.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Windows.Forms;
+using PKHeX.Core;
+
+namespace PKHeX.WinForms;
+
+public partial class SAV_Misc2 : Form
+{
+    private readonly SaveFile Origin;
+    private readonly SAV2 SAV;
+
+    public SAV_Misc2(SAV2 sav)
+    {
+        InitializeComponent();
+        WinFormsUtil.TranslateInterface(this, Main.CurrentLanguage);
+        SAV = (SAV2)(Origin = sav).Clone();
+
+        B_VirtualConsoleGSBall.Visible = SAV.Version is GameVersion.C;
+        B_VirtualConsoleGSBall.Enabled = !SAV.IsEnabledGSBallMobileEvent;
+    }
+
+    private void B_Save_Click(object sender, EventArgs e)
+    {
+        Origin.CopyChangesFrom(SAV);
+        Close();
+    }
+
+    private void B_Cancel_Click(object sender, EventArgs e) => Close();
+
+    private void B_VirtualConsoleGSBall_Click(object sender, EventArgs e)
+    {
+        // Don't bother checking if the save is from Virtual Console.
+        // Can be moved between VC and GB era, and can be a quick way to enable the event on either.
+        SAV.EnableGSBallMobileEvent();
+        B_VirtualConsoleGSBall.Enabled = false;
+        System.Media.SystemSounds.Asterisk.Play();
+    }
+}