Added checks for null characters in Gen4 strings.

Attr: Mythra

library/Structures/Pokemon4.cs

@@ -365,6 +365,10 @@ namespace PkmnFoundations.Structures
                 if (move.MoveID > 467) return new ValidationSummary() { IsValid = false };
             }
 
+            var thePokemon4 = (Pokemon4)thePokemon;
+            if (!thePokemon4.NicknameEncoded.IsValid) return new ValidationSummary() { IsValid = false };
+            if (!thePokemon4.TrainerNameEncoded.IsValid) return new ValidationSummary() { IsValid = false };
+
             return new ValidationSummary() { IsValid = true };
         }
     }

library/Structures/PokemonParty4.cs

@@ -64,8 +64,8 @@ namespace PkmnFoundations.Structures
                     BitConverter.ToUInt16(block, 16),
                     BitConverter.ToUInt16(block, 18));
 
-                Unknown7 = new byte[56];
-                Array.Copy(block, 20, Unknown7, 0, 56);
+                HeldItemTrash = new byte[56];
+                Array.Copy(block, 20, HeldItemTrash, 0, 56);
                 Seals = new byte[24];
                 Array.Copy(block, 76, Seals, 0, 24);
             }
@@ -79,7 +79,7 @@ namespace PkmnFoundations.Structures
         public byte CapsuleIndex { get; set; }
         public override ushort HP { get { return _HP; } } // remaining hp
         public ushort _HP { get; set; }
-        public byte[] Unknown7 { get; set; } // 56 bytes
+        public byte[] HeldItemTrash { get; set; } // 56 bytes
         public byte[] Seals { get; set; } // 24 bytes
 
         // cached stats on the party structure. This gives rise to the

library/Support/EncodedString4.cs

@@ -90,6 +90,20 @@ namespace PkmnFoundations.Support
             return EncodeString_impl(str, size);
         }
 
+        public override bool IsValid
+        {
+            get
+            {
+                for (int i = 0; i < RawData.Length; i += 2)
+                {
+                    ushort gamecode = BitConverter.ToUInt16(RawData, i);
+                    if (gamecode == 0xffff) break;
+                    if (gamecode == 0x0000) return false;
+                }
+                return true;
+            }
+        }
+
         public EncodedString4 Clone()
         {
             return new EncodedString4(RawData);

library/Support/EncodedStringBase.cs

@@ -113,5 +113,12 @@ namespace PkmnFoundations.Support
 
         public virtual int Size { get; protected set; }
 
+        public virtual bool IsValid
+        {
+            get
+            {
+                return true;
+            }
+        }
     }
 }

library/Wfc/GtsRecord4.cs

@@ -198,6 +198,7 @@ namespace PkmnFoundations.Wfc
 
             // Forbid ball capsules. Credit: Gannio
             if (((PokemonParty4)Pokemon).CapsuleIndex != 0) return false;
+            if (!TrainerNameEncoded.IsValid) return false;
 
             return true;
         }