From 5dec94d4569e37ff3094c2ca790dabbaa6975318 Mon Sep 17 00:00:00 2001
From: Kurt <kaphotics@gmail.com>
Date: Mon, 25 Nov 2019 00:16:16 -0800
Subject: [PATCH] Handle banned form eggs with more flexibility

Closes #2519
better to not generate the encounter as opposed to flagging it after
generation
---
 .../Encounters/Generator/EncounterEggGenerator.cs   | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/PKHeX.Core/Legality/Encounters/Generator/EncounterEggGenerator.cs b/PKHeX.Core/Legality/Encounters/Generator/EncounterEggGenerator.cs
index 1d036bbfd..c06dc7611 100644
--- a/PKHeX.Core/Legality/Encounters/Generator/EncounterEggGenerator.cs
+++ b/PKHeX.Core/Legality/Encounters/Generator/EncounterEggGenerator.cs
@@ -24,8 +24,8 @@ public static IEnumerable<EncounterEgg> GenerateEggs(PKM pkm, IReadOnlyList<EvoC
             int gen = pkm.GenNumber;
             if (gen <= 1)
                 yield break; // can't get eggs
-            if (FormConverter.IsTotemForm(species, pkm.AltForm, gen))
-                yield break; // no totem eggs
+            if (NoHatchFromEggForm(species, pkm.AltForm, gen))
+                yield break; // can't originate from eggs
 
             // version is a true indicator for all generation 3-5 origins
             var ver = (GameVersion)pkm.Version;
@@ -52,6 +52,15 @@ public static IEnumerable<EncounterEgg> GenerateEggs(PKM pkm, IReadOnlyList<EvoC
             }
         }
 
+        private static bool NoHatchFromEggForm(int species, int form, int gen)
+        {
+            if (FormConverter.IsTotemForm(species, form, gen))
+                return true;
+            if ((species == (int) Species.Sinistea || species == (int) Species.Polteageist) && form != 0) // Chipped = impossible
+                return true; // can't get Chipped eggs
+            return false;
+        }
+
         // Gen6+ update the origin game when hatched. Quick manip for X.Y<->A.O | S.M<->US.UM, ie X->A
         private static GameVersion GetOtherTradePair(GameVersion ver)
         {