diff --git a/PKHeX.Core/PersonalInfo/PersonalInfo.cs b/PKHeX.Core/PersonalInfo/PersonalInfo.cs
index 6350cb529..e1043fca5 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfo.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfo.cs
@@ -78,11 +78,13 @@ public int[] EggGroups
         /// </summary>
         public bool[][] SpecialTutors { get; protected set; } = new bool[0][];
 
-        protected static bool[] GetBits(byte[] data)
+        protected static bool[] GetBits(byte[] data, int start = 0, int length = -1)
         {
-            bool[] r = new bool[data.Length<<3];
+            if (length < 0)
+                length = data.Length;
+            bool[] r = new bool[length << 3];
             for (int i = 0; i < r.Length; i++)
-                r[i] = (data[i>>3] >> (i&7) & 0x1) == 1;
+                r[i] = (data[start + (i >> 3)] >> (i & 7) & 0x1) == 1;
             return r;
         }
         protected static byte[] SetBits(bool[] bits)
@@ -96,12 +98,11 @@ protected static byte[] SetBits(bool[] bits)
         /// <summary>
         /// Injects supplementary TM/HM compatibility which is not present in the generation specific <see cref="PersonalInfo"/> format.
         /// </summary>
-        /// <param name="data"></param>
-        internal void AddTMHM(byte[] data) => TMHM = GetBits(data);
+        internal void AddTMHM(byte[] data, int start = 0, int length = -1) => TMHM = GetBits(data, start, length);
         /// <summary>
         /// Injects supplementary Type Tutor compatibility which is not present in the generation specific <see cref="PersonalInfo"/> format.
         /// </summary>
-        internal void AddTypeTutors(byte[] data) => TypeTutors = GetBits(data);
+        internal void AddTypeTutors(byte[] data, int start = 0, int length = -1) => TypeTutors = GetBits(data, start, length);
 
         /// <summary>
         /// Gets the <see cref="PersonalTable"/> <see cref="PKM.AltForm"/> entry index for the input criteria, with fallback for the original species entry.
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfoB2W2.cs b/PKHeX.Core/PersonalInfo/PersonalInfoB2W2.cs
index 804c988d6..26ec460f2 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfoB2W2.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfoB2W2.cs
@@ -1,6 +1,4 @@
-using System.Linq;
-
-namespace PKHeX.Core
+namespace PKHeX.Core
 {
     /// <summary>
     /// <see cref="PersonalInfo"/> class with values from the Black 2 & White 2 games.
@@ -15,14 +13,14 @@ public PersonalInfoB2W2(byte[] data)
             Data = data;
 
             // Unpack TMHM & Tutors
-            TMHM = GetBits(Data.Skip(0x28).Take(0x10).ToArray());
-            TypeTutors = GetBits(Data.Skip(0x38).Take(0x4).ToArray());
+            TMHM = GetBits(Data, 0x28, 0x10);
+            TypeTutors = GetBits(Data, 0x3, 0x4);
             SpecialTutors = new[]
             {
-                GetBits(Data.Skip(0x3C).Take(0x04).ToArray()),
-                GetBits(Data.Skip(0x40).Take(0x04).ToArray()),
-                GetBits(Data.Skip(0x44).Take(0x04).ToArray()),
-                GetBits(Data.Skip(0x48).Take(0x04).ToArray()),
+                GetBits(Data, 0x3C, 0x04),
+                GetBits(Data, 0x40, 0x04),
+                GetBits(Data, 0x44, 0x04),
+                GetBits(Data, 0x48, 0x04),
             };
         }
 
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfoBW.cs b/PKHeX.Core/PersonalInfo/PersonalInfoBW.cs
index d72bf8992..8ff40d1c9 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfoBW.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfoBW.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Linq;
 
 namespace PKHeX.Core
 {
@@ -17,8 +16,8 @@ public PersonalInfoBW(byte[] data)
             Data = data;
 
             // Unpack TMHM & Tutors
-            TMHM = GetBits(Data.Skip(0x28).Take(0x10).ToArray());
-            TypeTutors = GetBits(Data.Skip(0x38).Take(0x4).ToArray());
+            TMHM = GetBits(Data, 0x28, 0x10);
+            TypeTutors = GetBits(Data, 0x38, 0x4);
         }
         public override byte[] Write()
         {
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfoG1.cs b/PKHeX.Core/PersonalInfo/PersonalInfoG1.cs
index 388fc4432..29fed794b 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfoG1.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfoG1.cs
@@ -1,6 +1,4 @@
-using System.Linq;
-
-namespace PKHeX.Core
+namespace PKHeX.Core
 {
     /// <summary>
     /// <see cref="PersonalInfo"/> class with values from Generation 1 games.
@@ -15,7 +13,7 @@ public PersonalInfoG1(byte[] data)
                 return;
 
             Data = data;
-            TMHM = GetBits(Data.Skip(0x14).Take(0x8).ToArray());
+            TMHM = GetBits(Data, 0x14, 0x8);
         }
         public override byte[] Write()
         {
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfoG2.cs b/PKHeX.Core/PersonalInfo/PersonalInfoG2.cs
index 5ec04af87..60ce44ee2 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfoG2.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfoG2.cs
@@ -1,6 +1,4 @@
-using System.Linq;
-
-namespace PKHeX.Core
+namespace PKHeX.Core
 {
     /// <summary>
     /// <see cref="PersonalInfo"/> class with values from Generation 2 games.
@@ -15,7 +13,7 @@ public PersonalInfoG2(byte[] data)
                 return;
 
             Data = data;
-            TMHM = GetBits(Data.Skip(0x18).Take(0x8).ToArray());
+            TMHM = GetBits(Data, 0x18, 0x8);
         }
         public override byte[] Write()
         {
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfoG4.cs b/PKHeX.Core/PersonalInfo/PersonalInfoG4.cs
index eb14e2b21..0c82aff76 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfoG4.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfoG4.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Linq;
 
 namespace PKHeX.Core
 {
@@ -16,7 +15,7 @@ public PersonalInfoG4(byte[] data)
             Data = data;
 
             // Unpack TMHM & Tutors
-            TMHM = GetBits(Data.Skip(0x1C).Take(0x0D).ToArray());
+            TMHM = GetBits(Data, 0x1C, 0x0D);
             TypeTutors = new bool[0]; // not stored in personal
         }
         public override byte[] Write()
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfoORAS.cs b/PKHeX.Core/PersonalInfo/PersonalInfoORAS.cs
index 91d237e1d..c05ca85d1 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfoORAS.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfoORAS.cs
@@ -1,6 +1,4 @@
-using System.Linq;
-
-namespace PKHeX.Core
+namespace PKHeX.Core
 {
     /// <summary>
     /// <see cref="PersonalInfo"/> class with values from the OR & AS games.
@@ -15,15 +13,15 @@ public PersonalInfoORAS(byte[] data)
             Data = data;
 
             // Unpack TMHM & Tutors
-            TMHM = GetBits(Data.Skip(0x28).Take(0x10).ToArray());
-            TypeTutors = GetBits(Data.Skip(0x38).Take(0x4).ToArray());
+            TMHM = GetBits(Data, 0x28, 0x10);
+            TypeTutors = GetBits(Data, 0x38, 0x4);
             // 0x3C-0x40 unknown
             SpecialTutors = new[]
             {
-                GetBits(Data.Skip(0x40).Take(0x04).ToArray()),
-                GetBits(Data.Skip(0x44).Take(0x04).ToArray()),
-                GetBits(Data.Skip(0x48).Take(0x04).ToArray()),
-                GetBits(Data.Skip(0x4C).Take(0x04).ToArray()),
+                GetBits(Data, 0x40, 0x04),
+                GetBits(Data, 0x44, 0x04),
+                GetBits(Data, 0x48, 0x04),
+                GetBits(Data, 0x4C, 0x04),
             };
         }
         public override byte[] Write()
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfoSM.cs b/PKHeX.Core/PersonalInfo/PersonalInfoSM.cs
index ef32c79d1..c8bbe1cf0 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfoSM.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfoSM.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Linq;
 
 namespace PKHeX.Core
 {
@@ -15,12 +14,12 @@ public PersonalInfoSM(byte[] data)
                 return;
             Data = data;
 
-            TMHM = GetBits(Data.Skip(0x28).Take(0x10).ToArray()); // 36-39
-            TypeTutors = GetBits(Data.Skip(0x38).Take(0x4).ToArray()); // 40
+            TMHM = GetBits(Data, 0x28, 0x10); // 36-39
+            TypeTutors = GetBits(Data, 0x38, 0x4); // 40
 
             SpecialTutors = new[]
             {
-                GetBits(Data.Skip(0x3C).Take(0x0A).ToArray()),
+                GetBits(Data, 0x3C, 0x0A),
             };
         }
         public override byte[] Write()
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfoXY.cs b/PKHeX.Core/PersonalInfo/PersonalInfoXY.cs
index 200dc50b0..eeb232c07 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfoXY.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfoXY.cs
@@ -1,6 +1,4 @@
-using System.Linq;
-
-namespace PKHeX.Core
+namespace PKHeX.Core
 {
     /// <summary>
     /// <see cref="PersonalInfo"/> class with values from the X & Y games.
@@ -16,8 +14,8 @@ public PersonalInfoXY(byte[] data)
             Data = data;
 
             // Unpack TMHM & Tutors
-            TMHM = GetBits(Data.Skip(0x28).Take(0x10).ToArray());
-            TypeTutors = GetBits(Data.Skip(0x38).Take(0x4).ToArray());
+            TMHM = GetBits(Data, 0x28, 0x10);
+            TypeTutors = GetBits(Data, 0x38, 0x4);
             // 0x3C-0x40 unknown
         }
         public override byte[] Write()