From 6db0b673db5f618e6b612aad9590be85f9436fb2 Mon Sep 17 00:00:00 2001
From: Kurt <kaphotics@gmail.com>
Date: Sat, 14 Apr 2018 18:20:58 -0700
Subject: [PATCH] Handle ??? type gen4 arceus form check

interstitial between steel & fire, shift the form value up by 1 if
applicable

https://projectpokemon.org/home/forums/topic/44806-arceus-not-legal/?tab=comments#comment-229774
---
 PKHeX.Core/Legality/Checks.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/PKHeX.Core/Legality/Checks.cs b/PKHeX.Core/Legality/Checks.cs
index 8e4e8fb0d..83abf59b2 100644
--- a/PKHeX.Core/Legality/Checks.cs
+++ b/PKHeX.Core/Legality/Checks.cs
@@ -2070,6 +2070,8 @@ namespace PKHeX.Core
                             form = Array.IndexOf(Legal.Arceus_Plate, item) + 1;
                         else if (777 <= item && item <= 793)
                             form = Array.IndexOf(Legal.Arceus_ZCrystal, item) + 1;
+                        if (pkm.Format == 4 && form >= 9)
+                            form++; // ??? type Form shifts everything by 1
 
                         if (form != pkm.AltForm)
                             AddLine(Severity.Invalid, V308, CheckIdentifier.Form);