Disable gen2 chain clamp

not sure of the implications, but fixes #2031
might have to rework this method to clean up the optional params if
things are misbehaving

PKHeX.Core/Legality/Evolutions/EvolutionChain.cs

@@ -251,7 +251,7 @@ internal static List<EvoCriteria> GetValidPreEvolutions(PKM pkm, int maxspecieso
                     new EvoCriteria { Species = 290, Level = pkm.GenNumber < 5 ? lvl : lvl-1, MinLevel = 1 }
                     // Shedinja spawns after evolving, which is after level up moves were prompted. Not for future generations.
                 };
-            if (maxspeciesorigin == -1 && pkm.InhabitedGeneration(2) && pkm.GenNumber == 1)
+            if (maxspeciesorigin == -1 && pkm.InhabitedGeneration(2) && pkm.Format <= 2 && pkm.GenNumber == 1)
                 maxspeciesorigin = MaxSpeciesID_2;
 
             int tree = maxspeciesorigin == MaxSpeciesID_2 ? 2 : pkm.Format;