Ensure pointers aren't used anymore when their parents are being deleted and they should be deleted themselves.

PkmnLibSharp/Library/Forme.cs

@@ -143,6 +143,12 @@ namespace PkmnLibSharp.Library
         {
         }
 
+        protected internal override void MarkAsDeleted()
+        {
+            base.MarkAsDeleted();
+            _moves?.MarkAsDeleted();
+        }
+
         protected override void DeletePtr()
         {
             SpeciesVariant.Destruct(Ptr);

PkmnLibSharp/Library/Items/ItemLibrary.cs

@@ -63,6 +63,15 @@ namespace PkmnLibSharp.Library.Items
         {
         }
 
+        protected internal override void MarkAsDeleted()
+        {
+            base.MarkAsDeleted();
+            foreach (var item in _cache)
+            {
+                item.Value.MarkAsDeleted();
+            }
+        }
+
         protected override void DeletePtr()
         {
             Creatureliblibrary.Generated.ItemLibrary.Destruct(Ptr);

PkmnLibSharp/Library/Moves/MoveLibrary.cs

@@ -66,6 +66,15 @@ namespace PkmnLibSharp.Library.Moves
         {
         }
 
+        protected internal override void MarkAsDeleted()
+        {
+            base.MarkAsDeleted();
+            foreach (var moveData in _cache)
+            {
+                moveData.Value.MarkAsDeleted();
+            }
+        }
+
         protected override void DeletePtr()
         {
             AttackLibrary.Destruct(Ptr);

PkmnLibSharp/Library/NatureLibrary.cs

@@ -58,5 +58,14 @@ namespace PkmnLibSharp.Library
         {
             Pkmnlib.Generated.NatureLibrary.Destruct(Ptr);
         }
+
+        protected internal override void MarkAsDeleted()
+        {
+            base.MarkAsDeleted();
+            foreach (var nature in _cache)
+            {
+                nature.Value.MarkAsDeleted();
+            }
+        }
     }
 }

PkmnLibSharp/Library/PokemonLibrary.cs

@@ -133,5 +133,17 @@ namespace PkmnLibSharp.Library
         {
             Pkmnlib.Generated.PokemonLibrary.Destruct(Ptr);
         }
+
+        protected internal override void MarkAsDeleted()
+        {
+            base.MarkAsDeleted();
+            _settings?.MarkAsDeleted();
+            _species?.MarkAsDeleted();
+            _moves?.MarkAsDeleted();
+            _items?.MarkAsDeleted();
+            _growthRateLibrary?.MarkAsDeleted();
+            _typeLibrary?.MarkAsDeleted();
+            _natureLibrary?.MarkAsDeleted();
+        }
     }
 }

PkmnLibSharp/Library/Species.cs

@@ -84,6 +84,15 @@ namespace PkmnLibSharp.Library
             return s;
         }
 
+        protected internal override void MarkAsDeleted()
+        {
+            base.MarkAsDeleted();
+            foreach (var forme in _formes)
+            {
+                forme.Value.MarkAsDeleted();
+            }
+        }
+
         protected override void DeletePtr()
         {
             PokemonSpecies.Destruct(Ptr);

PkmnLibSharp/Library/SpeciesLibrary.cs

@@ -67,5 +67,14 @@ namespace PkmnLibSharp.Library
         {
             Creatureliblibrary.Generated.SpeciesLibrary.Destruct(Ptr);
         }
+
+        protected internal override void MarkAsDeleted()
+        {
+            base.MarkAsDeleted();
+            foreach (var species in _cache)
+            {
+                species.Value.MarkAsDeleted();
+            }
+        }
     }
 }