Clear cached species and forme when evolving a Pokemon.

PkmnLibSharp/Battling/Pokemon.cs

@@ -526,6 +526,9 @@ namespace PkmnLibSharp.Battling
         public void Evolve(Species species, Forme forme)
         {
             Pkmnlib.Generated.Pokemon.Evolve(Ptr, species.Ptr, forme.Ptr).Assert();
+            // Clear cached species and forme.
+            _species = species;
+            _forme = forme;
         }
 
         private Species? _displaySpecies;