diff --git a/PKHeX.Core/Util/ArrayUtil.cs b/PKHeX.Core/Util/ArrayUtil.cs
index 0276aca1a..37d72b5c9 100644
--- a/PKHeX.Core/Util/ArrayUtil.cs
+++ b/PKHeX.Core/Util/ArrayUtil.cs
@@ -184,5 +184,24 @@ internal static T[] ConcatAll<T>(params T[][] arr)
 
             return result;
         }
+
+        internal static T[] ConcatAll<T>(T[] arr1, T[] arr2)
+        {
+            int len = arr1.Length + arr2.Length;
+            var result = new T[len];
+            arr1.CopyTo(result, 0);
+            arr2.CopyTo(result, arr1.Length);
+            return result;
+        }
+
+        internal static T[] ConcatAll<T>(T[] arr1, T[] arr2, T[] arr3)
+        {
+            int len = arr1.Length + arr2.Length + arr3.Length;
+            var result = new T[len];
+            arr1.CopyTo(result, 0);
+            arr2.CopyTo(result, arr1.Length);
+            arr3.CopyTo(result, arr1.Length + arr2.Length);
+            return result;
+        }
     }
 }
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