diff --git a/PKHeX.Core/Saves/Substructures/PokeDex/Zukan8.cs b/PKHeX.Core/Saves/Substructures/PokeDex/Zukan8.cs
index cf20b78ed..d84e4de39 100644
--- a/PKHeX.Core/Saves/Substructures/PokeDex/Zukan8.cs
+++ b/PKHeX.Core/Saves/Substructures/PokeDex/Zukan8.cs
@@ -264,6 +264,8 @@ public override void SetDex(PKM pkm)
             if (index < 0)
                 return;
 
+            bool owned = GetCaught(species);
+
             var g = pkm.Gender == 1 ? 1 : 0;
             bool shiny = pkm.IsShiny;
             var s = shiny ? 2 : 0;
@@ -282,7 +284,8 @@ public override void SetDex(PKM pkm)
             SetSeenRegion(species, form, g | s);
             SetCaught(species);
             SetIsLanguageObtained(species, pkm.Language);
-            SetAltFormDisplayed(species, (byte)form);
+            if (!owned)
+                SetAltFormDisplayed(species, (byte)form);
 
             if (shiny)
                 SetDisplayShiny(species);