diff --git a/PKHeX.Core/PKM/PKM.cs b/PKHeX.Core/PKM/PKM.cs
index 39cf09dd9..a2972d0e7 100644
--- a/PKHeX.Core/PKM/PKM.cs
+++ b/PKHeX.Core/PKM/PKM.cs
@@ -895,5 +895,27 @@ public void TransferPropertiesWithReflection(PKM Source, PKM Destination)
                     ReflectUtil.SetValue(Destination, property, prop);
             }
         }
+
+        /// <summary>
+        /// Clears moves that a <see cref="PKM"/> may have, possibly from a future generation.
+        /// </summary>
+        public void ClearInvalidMoves()
+        {
+            uint invalid = 0;
+            var moves = Moves;
+            for (var i = 0; i < moves.Length; i++)
+            {
+                if (moves[i] <= MaxMoveID)
+                    continue;
+
+                invalid++;
+                moves[i] = 0;
+            }
+            if (invalid == 0)
+                return;
+
+            Moves = moves;
+            FixMoves();
+        }
     }
 }
diff --git a/PKHeX.Core/PKM/PKMConverter.cs b/PKHeX.Core/PKM/PKMConverter.cs
index fc9225750..fbcb91e0f 100644
--- a/PKHeX.Core/PKM/PKMConverter.cs
+++ b/PKHeX.Core/PKM/PKMConverter.cs
@@ -227,6 +227,7 @@ public static PKM convertToFormat(PKM pk, Type PKMType, out string comment)
                                 return null;
                             }
                             pkm = ((PK2) pk).convertToPK1();
+                            pkm.ClearInvalidMoves();
                         }
                         else
                             pkm = null;