diff --git a/PKHeX.Core/Legality/LearnSource/Group/LearnGroupHOME.cs b/PKHeX.Core/Legality/LearnSource/Group/LearnGroupHOME.cs
index 9486dd292..195431381 100644
--- a/PKHeX.Core/Legality/LearnSource/Group/LearnGroupHOME.cs
+++ b/PKHeX.Core/Legality/LearnSource/Group/LearnGroupHOME.cs
@@ -246,7 +246,7 @@ private static void AddExclusiveMoves(Span<bool> result, PKM pk)
         IEncounterTemplate enc,
         MoveSourceType types, LearnOption option, ReadOnlySpan<EvoCriteria> evos, IHomeSource local) where T : ILearnGroup
     {
-        var length = instance.MaxMoveID;
+        var length = instance.MaxMoveID + 1;
         var rent = ArrayPool<bool>.Shared.Rent(length);
         var temp = rent.AsSpan(0, length);
         instance.GetAllMoves(temp, pk, history, enc, types, option);