diff --git a/PKHeX.Core/PKM/Shared/G4PKM.cs b/PKHeX.Core/PKM/Shared/G4PKM.cs
index e3d9e15e1..e41fac98b 100644
--- a/PKHeX.Core/PKM/Shared/G4PKM.cs
+++ b/PKHeX.Core/PKM/Shared/G4PKM.cs
@@ -289,7 +289,7 @@ public sealed override byte Ball
             BallDPPt = Clamp(value, Core.Ball.Cherish);
 
             // Only set the HG/SS value if it originated in HG/SS and was not an event.
-            if (WasCreatedInHGSS)
+            if (WasCreatedInHGSS && this is not BK4)
                 BallHGSS = Clamp(value, Core.Ball.Sport);
             else
                 BallHGSS = 0;