diff --git a/PKHeX.Core/Legality/LegalityCheckStrings.cs b/PKHeX.Core/Legality/LegalityCheckStrings.cs
index ca930f280..c35b401fc 100644
--- a/PKHeX.Core/Legality/LegalityCheckStrings.cs
+++ b/PKHeX.Core/Legality/LegalityCheckStrings.cs
@@ -111,6 +111,7 @@ public static class LegalityCheckStrings
         public static string LEggPP { get; set; } = "Eggs cannot have modified move PP counts.";
         public static string LEggPPUp { get; set; } = "Cannot apply PP Ups to an Egg.";
         public static string LEggShinyLeaf { get; set; } = "Eggs cannot have Shiny Leaf/Crown.";
+        public static string LEggShinyPokeStar { get; set; } = "Eggs cannot be a Pokéstar Studios star.";
         public static string LEggSpecies { get; set; } = "Can't obtain Egg for this species.";
         public static string LEggUnhatched { get; set; } = "Valid un-hatched Egg.";
 
diff --git a/PKHeX.Core/Legality/Verifiers/MiscVerifier.cs b/PKHeX.Core/Legality/Verifiers/MiscVerifier.cs
index bc23bd30c..082daf673 100644
--- a/PKHeX.Core/Legality/Verifiers/MiscVerifier.cs
+++ b/PKHeX.Core/Legality/Verifiers/MiscVerifier.cs
@@ -23,6 +23,9 @@ public override void Verify(LegalityAnalysis data)
 
                 switch (pkm)
                 {
+                    case PK5 pk5 when pk5.PokeStarFame != 0 && pk5.IsEgg:
+                        data.AddLine(GetInvalid(LEggShinyPokeStar, CheckIdentifier.Egg));
+                        break;
                     case PK4 pk4 when pk4.ShinyLeaf != 0:
                         data.AddLine(GetInvalid(LEggShinyLeaf, CheckIdentifier.Egg));
                         break;
diff --git a/PKHeX.Core/PKM/PK5.cs b/PKHeX.Core/PKM/PK5.cs
index fee65bf06..870483cf6 100644
--- a/PKHeX.Core/PKM/PK5.cs
+++ b/PKHeX.Core/PKM/PK5.cs
@@ -8,7 +8,13 @@ public sealed class PK5 : PKM, IRibbonSetEvent3, IRibbonSetEvent4, IRibbonSetUni
     {
         private static readonly byte[] Unused =
         {
-            0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x5E, 0x63, 0x64, 0x65, 0x66, 0x67, 0x87
+            0x87, // PokeStar Fame -- this is first to prevent 0x42 from being the first ExtraByte as this byte has GUI functionality
+            0x42, // Hidden Ability/NPokemon
+            0x43, 0x44, 0x45, 0x46, 0x47,
+            0x5E, // unused
+            0x63, // last 8 bits of a 32bit ribbonset
+            0x64, 0x65, 0x66, 0x67, // unused 32bit ribbonset?
+            0x86, // unused
         };
 
         public override byte[] ExtraBytes => Unused;
@@ -239,7 +245,9 @@ public PK5(byte[] decryptedData, string ident = null)
         public override int Met_Level { get => Data[0x84] & ~0x80; set => Data[0x84] = (byte)((Data[0x84] & 0x80) | value); }
         public override int OT_Gender { get => Data[0x84] >> 7; set => Data[0x84] = (byte)((Data[0x84] & ~0x80) | value << 7); }
         public override int EncounterType { get => Data[0x85]; set => Data[0x85] = (byte)value; }
-        // 0x86-0x87 Unused
+        // 0x86 Unused
+        public byte PokeStarFame { get => Data[0x87]; set => Data[0x87] = value; }
+        public bool IsPokeStar { get => PokeStarFame > 250; set => PokeStarFame = 255; }
         #endregion
 
         #region Battle Stats