Add $rand0/$rand3 batch cmd for dudu/maus rare

.EncryptionConstant=$rand0
.EncryptionConstant=$rand3
^ both will randomize so EC%100 = 0

Additionally, added $rand0/$randB/$randS for Wurmple/Beautifly/Silcoon to force EC%10 [0,4], otherwise EC%10 will be [5,9] for the Cascoon/Dustox evolution.

For neither of the two above cases, can do EC%6=last char if someone cares about the EC tiebreaker for characteristic determination. No, I don't want to consider how allow the above cases to do that too :) -- just write your own syntax via a plugin and add your ComplexSet to the list!

Author: kwsch

PKHeX.Core/Editing/Bulk/BatchMods.cs

@@ -79,8 +79,35 @@ public static class BatchMods
 
         new ComplexSet(nameof(PKM.Species), value => value == "0", (pk, _) => Array.Clear(pk.Data, 0, pk.Data.Length)),
         new ComplexSet(nameof(PKM.IsNicknamed), value => string.Equals(value, "false", StringComparison.OrdinalIgnoreCase), (pk, _) => pk.SetDefaultNickname()),
+
+        // Complicated
+        new ComplexSet(nameof(PKM.EncryptionConstant), value => value.StartsWith(CONST_RAND), (pk, cmd) => SetComplicatedEC(pk, cmd.PropertyValue[^1])),
     };
 
+    private static void SetComplicatedEC(PKM pk, char option)
+    {
+        var rng = Util.Rand;
+        uint rand = rng.Rand32();
+        uint mod = 1, noise = 0;
+        if (pk.Species is >= (int)Species.Wurmple and <= (int)Species.Dustox)
+        {
+            mod = 10;
+            bool lower = option is '0' or 'B' or 'S' || WurmpleUtil.GetWurmpleEvoGroup(pk.Species) == 0;
+            noise = (lower ? 0u : 5u) + (uint)rng.Next(0, 5);
+        }
+        else if (pk.Species is (int)Species.Dunsparce or (int)Species.Dudunsparce or (int)Species.Tandemaus or (int)Species.Maushold)
+        {
+            mod = 100;
+            noise = option is '0' or '3' ? 0u : (uint)rng.Next(1, 100);
+        }
+        else if (option is >= '0' and <= '5')
+        {
+            mod = 6;
+            noise = (uint)(option - '0');
+        }
+        pk.EncryptionConstant = unchecked(rand - (rand % mod) + noise);
+    }
+
     private static void SetRandomEVs(PKM pk)
     {
         Span<int> evs = stackalloc int[6];