From 00c0aefe00c72bfba6d5073fac16e91be7488a60 Mon Sep 17 00:00:00 2001
From: Kurt <kaphotics@gmail.com>
Date: Sat, 13 Jan 2024 21:08:45 -0800
Subject: [PATCH] Add simple alolan evo trim for HOME+ permit

Closes #4159
---
 .../Evolutions/EvolutionGroup/EvolutionGroupHOME.cs   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/PKHeX.Core/Legality/Evolutions/EvolutionGroup/EvolutionGroupHOME.cs b/PKHeX.Core/Legality/Evolutions/EvolutionGroup/EvolutionGroupHOME.cs
index 68db850f5..9cd7d761c 100644
--- a/PKHeX.Core/Legality/Evolutions/EvolutionGroup/EvolutionGroupHOME.cs
+++ b/PKHeX.Core/Legality/Evolutions/EvolutionGroup/EvolutionGroupHOME.cs
@@ -56,11 +56,22 @@ public int Devolve(Span<EvoCriteria> result, PKM pk, EvolutionOrigin enc)
 
     public int Evolve(Span<EvoCriteria> result, PKM pk, EvolutionOrigin enc, EvolutionHistory history)
     {
+        if (IsUnavailableEvoChain(pk.Species, pk.Form))
+            result = result[..1]; // Only allow the highest (current).
         if (CheckAllAdjacent(pk, enc))
             return EvolveMulti(result, pk, enc, history);
         return EvolveSingle(result, pk, enc, history);
     }
 
+    private static bool IsUnavailableEvoChain(ushort species, byte form) => species switch
+    {
+        // Split-evolution Alolans can't be reached in any game Gen8+. Must have been via Gen7.
+        (int)Species.Raichu when form == 1 => true,
+        (int)Species.Exeggutor when form == 1 => true,
+        (int)Species.Marowak when form == 1 => true,
+        _ => false,
+    };
+
     private int DevolveMulti(Span<EvoCriteria> result, PKM pk, in EvolutionOrigin enc)
     {
         int present = 1;