diff --git a/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3.cs b/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3.cs
index fecd75501..1be4a3e7b 100644
--- a/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3.cs
@@ -5,6 +5,8 @@ namespace PKHeX.Core;
 
 public sealed class SecretBase3(Memory<byte> raw)
 {
+    public const int SIZE = 160;
+
     private Span<byte> Data => raw.Span;
 
     private bool Japanese => Language == (int) LanguageID.Japanese;
@@ -59,7 +61,7 @@ public ushort SecretBasesReceived
     public Span<byte> GetDecorationCoordinates() => Data.Slice(0x22, 0x10);
     public void SetDecorationCoordinates(Span<byte> value) => value.CopyTo(GetDecorationCoordinates());
 
-    private Span<byte> TeamData => Data.Slice(50, 72);
+    private Span<byte> TeamData => Data.Slice(0x34, 108);
     public SecretBase3Team Team
     {
         get => new(TeamData.ToArray());
diff --git a/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3PKM.cs b/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3PKM.cs
index 20e241ecb..af69e9d80 100644
--- a/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3PKM.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3PKM.cs
@@ -11,7 +11,12 @@ public sealed class SecretBase3PKM : ISpeciesForm
     public ushort Move2 { get; set; }
     public ushort Move3 { get; set; }
     public ushort Move4 { get; set; }
-    public ushort Species { get; set; }
+    public ushort SpeciesInternal { get; set; }
+    public ushort Species
+    {
+        get => SpeciesConverter.GetNational3(SpeciesInternal);
+        set => SpeciesInternal = SpeciesConverter.GetInternal3(value);
+    }
     public ushort HeldItem { get; set; }
     public byte Level { get; set; }
     public byte EVAll { get; set; }
diff --git a/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3Team.cs b/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3Team.cs
index ac31e96d5..94e8f01c0 100644
--- a/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3Team.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen3/SecretBase3Team.cs
@@ -7,10 +7,10 @@ public sealed class SecretBase3Team
 {
     private const int O_PID = 0;
     private const int O_Moves = 0x18;
-    private const int O_Species = 0x24;
-    private const int O_Item = 0x30;
-    private const int O_Level = 0x3C;
-    private const int O_EV = 0x42;
+    private const int O_Species = 0x48;
+    private const int O_Item = 0x54;
+    private const int O_Level = 0x60;
+    private const int O_EV = 0x66;
 
     private static int GetOffsetPID(int index) => O_PID + (index * 4);
     private static int GetOffsetMove(int index, int moveIndex) => O_Moves + (index * 8) + (moveIndex * 2);
@@ -22,10 +22,10 @@ public sealed class SecretBase3Team
 
     public SecretBase3Team(byte[] data)
     {
+        Data = data;
         Team = new SecretBase3PKM[6];
         for (int i = 0; i < Team.Length; i++)
             Team[i] = GetPKM(i);
-        Data = data;
     }
 
     public byte[] Write()