diff --git a/PKHeX.Core/Legality/Encounters/EncounterSlot/EncounterSlot9.cs b/PKHeX.Core/Legality/Encounters/EncounterSlot/EncounterSlot9.cs
index 9be015153..86ad852d2 100644
--- a/PKHeX.Core/Legality/Encounters/EncounterSlot/EncounterSlot9.cs
+++ b/PKHeX.Core/Legality/Encounters/EncounterSlot/EncounterSlot9.cs
@@ -21,13 +21,16 @@ protected override void ApplyDetails(ITrainerInfo sav, EncounterCriteria criteri
 
         var pk9 = (PK9)pk;
         pk9.Obedience_Level = (byte)pk.Met_Level;
-        var type = Tera9RNG.GetTeraTypeFromPersonal(Species, Form, Util.Rand.Rand64());
+        var rand = new Xoroshiro128Plus(Util.Rand.Rand64());
+        var type = Tera9RNG.GetTeraTypeFromPersonal(Species, Form, rand.Next());
         pk9.TeraTypeOriginal = (MoveType)type;
         if (criteria.TeraType != -1 && type != criteria.TeraType)
             pk9.SetTeraType(type); // sets the override type
         if (Gender != -1)
             pk.Gender = (byte)Gender;
         pk9.Scale = PokeSizeUtil.GetRandomScalar();
+        if (Species == (int)Core.Species.Toxtricity)
+            pk.Nature = ToxtricityUtil.GetRandomNature(ref rand, Form);
         pk9.EncryptionConstant = Util.Rand32();
     }
 }
diff --git a/PKHeX.Core/Legality/RNG/Methods/Encounter9RNG.cs b/PKHeX.Core/Legality/RNG/Methods/Encounter9RNG.cs
index 963878440..4f0b3108c 100644
--- a/PKHeX.Core/Legality/RNG/Methods/Encounter9RNG.cs
+++ b/PKHeX.Core/Legality/RNG/Methods/Encounter9RNG.cs
@@ -122,7 +122,9 @@ public static bool GenerateData(PK9 pk, in GenerateParam9 enc, EncounterCriteria
             return false;
         pk.Gender = gender;
 
-        var nature = (int)rand.NextInt(25);
+        byte nature = pk.Species == (int)Species.Toxtricity
+                ? ToxtricityUtil.GetRandomNature(ref rand, pk.Form)
+                : (byte)rand.NextInt(25);
         if (criteria.Nature != Nature.Random && nature != (int)criteria.Nature)
             return false;
         pk.Nature = pk.StatNature = nature;
@@ -223,7 +225,9 @@ public static bool IsMatch(PKM pk, in GenerateParam9 enc, in ulong seed)
         if (pk.Gender != gender)
             return false;
 
-        var nature = (int)rand.NextInt(25);
+        int nature = pk.Species == (int)Species.Toxtricity
+                ? ToxtricityUtil.GetRandomNature(ref rand, pk.Form)
+                : (byte)rand.NextInt(25);
         if (pk.Nature != nature)
             return false;
 
diff --git a/PKHeX.Core/Legality/RNG/Methods/ToxtricityUtil.cs b/PKHeX.Core/Legality/RNG/Methods/ToxtricityUtil.cs
new file mode 100644
index 000000000..29a33e09a
--- /dev/null
+++ b/PKHeX.Core/Legality/RNG/Methods/ToxtricityUtil.cs
@@ -0,0 +1,13 @@
+namespace PKHeX.Core;
+
+public static class ToxtricityUtil
+{
+    private static readonly byte[] Nature0 = { 3, 4, 2, 8, 9, 19, 22, 11, 13, 14, 0, 6, 24 };
+    private static readonly byte[] Nature1 = { 1, 5, 7, 10, 12, 15, 16, 17, 18, 20, 21, 23 };
+
+    public static byte GetRandomNature(ref Xoroshiro128Plus rand, byte form)
+    {
+        var table = form == 0 ? Nature0 : Nature1;
+        return table[rand.NextInt((uint)table.Length)];
+    }
+}
diff --git a/PKHeX.Core/Legality/RNG/RaidRNG.cs b/PKHeX.Core/Legality/RNG/RaidRNG.cs
index 95126b7a9..4973cbfc8 100644
--- a/PKHeX.Core/Legality/RNG/RaidRNG.cs
+++ b/PKHeX.Core/Legality/RNG/RaidRNG.cs
@@ -143,34 +143,12 @@ private static bool Verify(PKM pk, ulong seed, Span<int> ivs, int iv_count, int
                 break;
         }
 
-        if (nature_param == -1)
-        {
-            if (pk.Species == (int) Species.Toxtricity && pk.Form == 0)
-            {
-                var table = Nature0;
-                var choice = table[rng.NextInt((uint)table.Length)];
-                if (pk.Nature != choice)
-                    return false;
-            }
-            else if (pk.Species == (int) Species.Toxtricity && pk.Form == 1)
-            {
-                var table = Nature1;
-                var choice = table[rng.NextInt((uint)table.Length)];
-                if (pk.Nature != choice)
-                    return false;
-            }
-            else
-            {
-                var nature = (int)rng.NextInt(25);
-                if (pk.Nature != nature)
-                    return false;
-            }
-        }
-        else
-        {
-            if (pk.Nature != nature_param)
-                return false;
-        }
+        int nature = nature_param != -1 ? nature_param
+            : pk.Species == (int)Species.Toxtricity
+                ? ToxtricityUtil.GetRandomNature(ref rng, pk.Form)
+                : (byte)rng.NextInt(25);
+        if (pk.Nature != nature)
+            return false;
 
         if (pk is IScaledSize s)
         {
@@ -272,28 +250,10 @@ private static bool ApplyDetailsTo(PKM pk, ulong seed, Span<int> ivs, int iv_cou
             _ => (int) rng.NextInt(252) + 1 < gender_ratio ? 1 : 0,
         };
 
-        int nature;
-        if (nature_param == -1)
-        {
-            if (pk.Species == (int)Species.Toxtricity && pk.Form == 0)
-            {
-                var table = Nature0;
-                nature = table[rng.NextInt((uint)table.Length)];
-            }
-            else if (pk.Species == (int)Species.Toxtricity && pk.Form == 1)
-            {
-                var table = Nature1;
-                nature = table[rng.NextInt((uint)table.Length)];
-            }
-            else
-            {
-                nature = (int)rng.NextInt(25);
-            }
-        }
-        else
-        {
-            nature = nature_param;
-        }
+        int nature = nature_param != -1 ? nature_param
+            : pk.Species == (int)Species.Toxtricity
+                ? ToxtricityUtil.GetRandomNature(ref rng, pk.Form)
+                : (byte)rng.NextInt(25);
 
         pk.StatNature = pk.Nature = nature;
 
@@ -323,7 +283,4 @@ private static uint GetShinyXor(uint pid, uint oid)
         var xor = pid ^ oid;
         return (xor ^ (xor >> 16)) & 0xFFFF;
     }
-
-    private static readonly byte[] Nature0 = {3, 4, 2, 8, 9, 19, 22, 11, 13, 14, 0, 6, 24};
-    private static readonly byte[] Nature1 = {1, 5, 7, 10, 12, 15, 16, 17, 18, 20, 21, 23};
 }