diff --git a/PKHeX.Core/Legality/Encounters/Data/Encounters3.cs b/PKHeX.Core/Legality/Encounters/Data/Encounters3.cs
index 4a4682568..a2d32fa80 100644
--- a/PKHeX.Core/Legality/Encounters/Data/Encounters3.cs
+++ b/PKHeX.Core/Legality/Encounters/Data/Encounters3.cs
@@ -79,7 +79,7 @@ namespace PKHeX.Core
         {
             foreach (EncounterArea Area in Areas.Where(a => a.Location == location))
             foreach (EncounterSlot Slot in Area.Slots)
-                Slot.Type = Slot.Type.GetSafariSlotType3();
+                Slot.Type |= SlotType.Safari;
         }
 
         private static readonly int[] Roaming_MetLocation_FRLG =
diff --git a/PKHeX.Core/Legality/Encounters/Data/Encounters4.cs b/PKHeX.Core/Legality/Encounters/Data/Encounters4.cs
index bf1560f35..34dfbe884 100644
--- a/PKHeX.Core/Legality/Encounters/Data/Encounters4.cs
+++ b/PKHeX.Core/Legality/Encounters/Data/Encounters4.cs
@@ -148,7 +148,7 @@ namespace PKHeX.Core
         {
             foreach (EncounterArea Area in Areas.Where(a => a.Location == location))
             foreach (EncounterSlot Slot in Area.Slots)
-                Slot.Type = Slot.Type.GetSafariSlotType4();
+                Slot.Type |= SlotType.Safari;
         }
         private static void MarkG4SwarmSlots(ref EncounterArea[] Areas, EncounterArea[] SwarmAreas)
         {
diff --git a/PKHeX.Core/Legality/Encounters/EncounterGenerator.cs b/PKHeX.Core/Legality/Encounters/EncounterGenerator.cs
index 9ae6dd36f..891661058 100644
--- a/PKHeX.Core/Legality/Encounters/EncounterGenerator.cs
+++ b/PKHeX.Core/Legality/Encounters/EncounterGenerator.cs
@@ -1377,9 +1377,7 @@ namespace PKHeX.Core
         }
         internal static bool IsSafariSlot(SlotType t)
         {
-            return t == SlotType.Grass_Safari || t == SlotType.Surf_Safari ||
-                   t == SlotType.Rock_Smash_Safari || t == SlotType.Pokeradar_Safari ||
-                   t == SlotType.Old_Rod_Safari || t == SlotType.Good_Rod_Safari || t == SlotType.Super_Rod_Safari;
+            return t.HasFlag(SlotType.Safari);
         }
         internal static bool IsDexNavValid(PKM pkm)
         {
diff --git a/PKHeX.Core/Legality/Structures/SlotType.cs b/PKHeX.Core/Legality/Structures/SlotType.cs
index d82226df7..fc47c9df2 100644
--- a/PKHeX.Core/Legality/Structures/SlotType.cs
+++ b/PKHeX.Core/Legality/Structures/SlotType.cs
@@ -1,84 +1,110 @@
-namespace PKHeX.Core
+using System;
+
+namespace PKHeX.Core
 {
     /// <summary>
     /// Wild Encounter data <see cref="EncounterSlot"/> Type
     /// </summary>
     /// <remarks>
     /// Different from <see cref="EncounterType"/>, this corresponds to the method that the <see cref="IEncounterable"/> may be encountered.</remarks>
+    [Flags]
     public enum SlotType
     {
-        Any,
-        Grass,
-        Rough_Terrain,
-        Yellow_Flowers,
-        Purple_Flowers,
-        Red_Flowers,
-        Surf,
-        Old_Rod,
-        Good_Rod,
-        Super_Rod,
-        Rock_Smash,
-        Horde,
-        FriendSafari,
-        Special,
-        SOS,
-        Swarm,
-        Headbutt,
-        Headbutt_Special,
-        Pokeradar,
-        HoneyTree,
-        HiddenGrotto,
-        BugContest,
-        Grass_Safari,
-        Surf_Safari,
-        Old_Rod_Safari,
-        Good_Rod_Safari,
-        Super_Rod_Safari,
-        Rock_Smash_Safari,
-        Pokeradar_Safari
+        /// <summary>
+        /// Default (un-assigned) encounter slot type.
+        /// </summary>
+        Any = 0,
+        /// <summary> 
+        /// Slot is encountered via Grass.
+        /// </summary>
+        Grass        = 1 << 00,
+        /// <summary>
+        /// Slot is encountered via Surfing.
+        /// </summary>
+        Surf         = 1 << 01,
+        /// <summary>
+        /// Slot is encountered via Old Rod (Fishing).
+        /// </summary>
+        Old_Rod      = 1 << 02,
+        /// <summary>
+        /// Slot is encountered via Good Rod (Fishing).
+        /// </summary>
+        Good_Rod     = 1 << 03,
+        /// <summary>
+        /// Slot is encountered via Super Rod (Fishing).
+        /// </summary>
+        Super_Rod    = 1 << 04,
+        /// <summary>
+        /// Slot is encountered via Rock Smash.
+        /// </summary>
+        Rock_Smash   = 1 << 05,
+        /// <summary>
+        /// Slot is encountered via a Horde.
+        /// </summary>
+        Horde        = 1 << 06,
+        /// <summary> 
+        /// Slot is encountered via the Friend Safari.
+        /// </summary>
+        FriendSafari = 1 << 07,
+        /// <summary>
+        /// Slot is encountered through special means. Used to signify special slots for Gen2, sometimes for later follow-up).
+        /// </summary>
+        Special      = 1 << 08,
+        /// <summary>
+        /// Slot is encountered via SOS signal.
+        /// </summary>
+        SOS          = 1 << 09,
+        /// <summary>
+        /// Slot is encountered in a Swarm.
+        /// </summary>
+        Swarm        = 1 << 10,
+        /// <summary>
+        /// Slot is encountered via Headbutt.
+        /// </summary>
+        Headbutt     = 1 << 11,
+        /// <summary>
+        /// Slot is encountered via the Poké Radar.
+        /// </summary>
+        Pokeradar    = 1 << 12,
+        /// <summary>
+        /// Slot is encountered via a Honey Tree.
+        /// </summary>
+        HoneyTree    = 1 << 13,
+        /// <summary>
+        /// Slot is encountered via a Hidden Grotto.
+        /// </summary>
+        HiddenGrotto = 1 << 14,
+        /// <summary>
+        /// Slot is encountered via the Bug Catching Contest.
+        /// </summary>
+        BugContest   = 1 << 15,
+        /// <summary>
+        /// Slot is encountered in the Safari Zone.
+        /// </summary>
+        Safari       = 1 << 16, // always used as a modifier to another slot type
+
+        Rough_Terrain  = 1 << 17,
+        Yellow_Flowers = 1 << 18,
+        Purple_Flowers = 1 << 19,
+        Red_Flowers    = 1 << 20,
+
+        // Combined
+        Headbutt_Special = Headbutt | Special,
+
+        Grass_Safari = Grass | Safari,
+        Surf_Safari = Surf | Safari,
+        Old_Rod_Safari = Old_Rod | Safari,
+        Good_Rod_Safari = Good_Rod | Safari,
+        Super_Rod_Safari = Super_Rod | Safari,
+        Rock_Smash_Safari = Rock_Smash | Safari,
+        Pokeradar_Safari = Pokeradar | Safari,
     }
 
     public static partial class Extensions
     {
-        internal static SlotType GetSafariSlotType3(this SlotType t)
-        {
-            switch (t)
-            {
-                case SlotType.Grass: return SlotType.Grass_Safari;
-                case SlotType.Surf: return SlotType.Surf_Safari;
-                case SlotType.Old_Rod: return SlotType.Old_Rod_Safari;
-                case SlotType.Good_Rod: return SlotType.Good_Rod_Safari;
-                case SlotType.Super_Rod: return SlotType.Super_Rod_Safari;
-                case SlotType.Rock_Smash: return SlotType.Rock_Smash_Safari;
-                default: return t;
-            }
-        }
-        internal static SlotType GetSafariSlotType4(this SlotType t)
-        {
-            switch (t)
-            {
-                case SlotType.Grass: return SlotType.Grass_Safari;
-                case SlotType.Surf: return SlotType.Surf_Safari;
-                case SlotType.Old_Rod: return SlotType.Old_Rod_Safari;
-                case SlotType.Good_Rod: return SlotType.Good_Rod_Safari;
-                case SlotType.Super_Rod: return SlotType.Super_Rod_Safari;
-                case SlotType.Pokeradar: return SlotType.Pokeradar_Safari;
-                default: return t;
-            }
-        }
         internal static bool IsFishingRodType(this SlotType t)
         {
-            switch (t)
-            {
-                case SlotType.Old_Rod:
-                case SlotType.Good_Rod:
-                case SlotType.Super_Rod:
-                case SlotType.Old_Rod_Safari:
-                case SlotType.Good_Rod_Safari:
-                case SlotType.Super_Rod_Safari:
-                    return true;
-                default: return false;
-            }
+            return t.HasFlag(SlotType.Old_Rod) || t.HasFlag(SlotType.Good_Rod) || t.HasFlag(SlotType.Super_Rod);
         }
     }
 }