diff --git a/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/GenerateMethodJ.cs b/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/GenerateMethodJ.cs
index 0ab0c9923..074a83143 100644
--- a/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/GenerateMethodJ.cs
+++ b/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/GenerateMethodJ.cs
@@ -37,11 +37,11 @@ public static class GenerateMethodJ
                     continue;
                 }
             }
-            var esv = LCRNG.Next16(ref seed) / 656;
+            var esv = LCRNG.Next16(ref seed) / 656u;
             if (esv < min || esv > max)
                 continue;
             var lv = randLevel ? LCRNG.Next16(ref seed) : 0;
-            var nature = LCRNG.Next16(ref seed) % 25;
+            var nature = MethodJ.GetNature(LCRNG.Next16(ref seed));
             if (criteria.IsSpecifiedNature() && nature != (byte)criteria.Nature)
                 continue;
 
diff --git a/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/GenerateMethodK.cs b/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/GenerateMethodK.cs
index b25846318..584ead0a5 100644
--- a/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/GenerateMethodK.cs
+++ b/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/GenerateMethodK.cs
@@ -23,7 +23,7 @@ public static class GenerateMethodK
         var ability = criteria.GetAbilityFromNumber(AbilityPermission.Any12);
         var (min, max) = SlotMethodK.GetRange(enc.Type, enc.SlotNumber);
         bool randLevel = MethodK.IsLevelRand(enc);
-        var modulo = enc.Type.IsSafari() ? 10 : 100;
+        var modulo = enc.Type.IsSafari() ? 10u : 100u;
         bool checkProc = MethodK.IsEncounterCheckApplicable(enc.Type);
 
         // Generate Method K correlated PID and IVs, no lead (keep things simple).
@@ -42,7 +42,7 @@ public static class GenerateMethodK
             if (esv < min || esv > max)
                 continue;
             var lv = randLevel ? LCRNG.Next16(ref seed) : 0;
-            var nature = LCRNG.Next16(ref seed) % 25;
+            var nature = MethodK.GetNature(LCRNG.Next16(ref seed));
             if (criteria.IsSpecifiedNature() && nature != (byte)criteria.Nature)
                 continue;
 
diff --git a/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/MethodJ.cs b/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/MethodJ.cs
index a66384bb4..1a46510b5 100644
--- a/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/MethodJ.cs
+++ b/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/MethodJ.cs
@@ -64,7 +64,7 @@ public static class MethodJ
 
     private static bool IsFeebasChance(uint rand) => (rand >> 15) == 1;
 
-    private static uint GetNature(uint rand) => rand / 0xA3Eu;
+    public static uint GetNature(uint rand) => rand / 0xA3Eu;
     public static uint GetHoneyTreeLevel(uint rand) => 5 + (rand / 0x1745); // 5957; rand(11) using the pre-compiled rand function.
 
     /// <summary>
diff --git a/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/MethodK.cs b/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/MethodK.cs
index 8367e21f1..50542b3e2 100644
--- a/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/MethodK.cs
+++ b/PKHeX.Core/Legality/RNG/ClassicEra/Gen4/MethodK.cs
@@ -65,7 +65,7 @@ public static class MethodK
   //private static bool IsIntimidateKeenEyeFail(uint rand) => (rand & 1) != 1;
     private static bool IsIntimidateKeenEyePass(uint rand) => (rand & 1) == 1;
 
-    private static uint GetNature(uint rand) => rand % 25;
+    public static uint GetNature(uint rand) => rand % 25;
 
     /// <summary>
     /// Gets the first possible origin seed and lead for the input encounter &amp; constraints.