diff --git a/PKHeX.Core/Legality/Encounters/Data/Live/EncounterServerDate.cs b/PKHeX.Core/Legality/Encounters/Data/Live/EncounterServerDate.cs
index 209530bad..cb121be29 100644
--- a/PKHeX.Core/Legality/Encounters/Data/Live/EncounterServerDate.cs
+++ b/PKHeX.Core/Legality/Encounters/Data/Live/EncounterServerDate.cs
@@ -110,5 +110,6 @@ public static bool IsValidDateWC9(WC9 card  , DateOnly obtained) => (WC9Gifts.Tr
         {0501, (new(2023, 02, 16), new(2023, 02, 21))}, // Jiseok's Garganacl
         {1513, (new(2023, 02, 27), new(2024, 03, 01))}, // Hisuian Zoroark DLC Purchase Gift
         {0502, (new(2023, 03, 31), new(2023, 07, 01))}, // TCG Flying Lechonk
+        {0503, (new(2023, 04, 13), new(2023, 04, 18))}, // Gavin's Palafin (-1 start date tolerance for GMT-10 regions)
     };
 }