diff --git a/PKHeX.Core/Editing/CommonEdits.cs b/PKHeX.Core/Editing/CommonEdits.cs
index eb963b9e0..5943c304a 100644
--- a/PKHeX.Core/Editing/CommonEdits.cs
+++ b/PKHeX.Core/Editing/CommonEdits.cs
@@ -547,7 +547,7 @@ namespace PKHeX.Core
         /// <returns>Highest value the value can be.</returns>
         public static int GetMaximumIV(this PKM pk, int index, bool Allow30 = false)
         {
-            if (pk.IVs[index] == pk.MaxIV && Allow30)
+            if (pk.GetIV(index) == pk.MaxIV && Allow30)
                 return pk.MaxIV - 1;
             return pk.MaxIV;
         }
@@ -593,6 +593,20 @@ namespace PKHeX.Core
                 pkm.SetHatchMemory6();
         }
 
+        /// <summary>
+        /// Force hatches a PKM by applying the current species name and a valid Met Location from the origin game.
+        /// </summary>
+        /// <param name="pkm">PKM to apply hatch details to</param>
+        /// <param name="origin">Game the egg originated from</param>
+        /// <param name="dest">Game the egg is currently present on</param>
+        public static void SetEggMetData(this PKM pkm, GameVersion origin, GameVersion dest)
+        {
+            bool traded = origin == dest;
+            var today = pkm.MetDate = DateTime.Today;
+            pkm.Egg_Location = EncounterSuggestion.GetSuggestedEncounterEggLocationEgg(pkm, traded);
+            pkm.EggMetDate = today;
+        }
+
         /// <summary>
         /// Maximizes the <see cref="PKM.CurrentFriendship"/>. If the <see cref="PKM.IsEgg"/>, the hatch counter is set to 1.
         /// </summary>
diff --git a/PKHeX.Core/Game/Gender.cs b/PKHeX.Core/Game/Gender.cs
new file mode 100644
index 000000000..4221dbd9c
--- /dev/null
+++ b/PKHeX.Core/Game/Gender.cs
@@ -0,0 +1,11 @@
+namespace PKHeX.Core
+{
+    public enum Gender : byte
+    {
+        Male = 0,
+        Female = 1,
+
+        Genderless = 2,
+        Random = Genderless,
+    }
+}
diff --git a/PKHeX.Core/Legality/Encounters/Generator/EncounterCriteria.cs b/PKHeX.Core/Legality/Encounters/Generator/EncounterCriteria.cs
new file mode 100644
index 000000000..012973e4a
--- /dev/null
+++ b/PKHeX.Core/Legality/Encounters/Generator/EncounterCriteria.cs
@@ -0,0 +1,86 @@
+namespace PKHeX.Core
+{
+    /// <summary>
+    /// Object that can be fed to a <see cref="IEncounterable"/> converter to ensure that the resulting <see cref="PKM"/> meets rough specifications.
+    /// </summary>
+    public class EncounterCriteria
+    {
+        public static readonly EncounterCriteria Unrestricted = new EncounterCriteria();
+
+        public int Ability { get; set; } = -1;
+        public int Gender { get; set; } = -1;
+        public Nature Nature { get; set; } = Nature.Random;
+        public Shiny Shiny { get; set; } = Shiny.Random;
+
+        public int IV_HP  { get; set; } = RandomIV;
+        public int IV_ATK { get; set; } = RandomIV;
+        public int IV_DEF { get; set; } = RandomIV;
+        public int IV_SPA { get; set; } = RandomIV;
+        public int IV_SPD { get; set; } = RandomIV;
+        public int IV_SPE { get; set; } = RandomIV;
+
+        public int HPType { get; set; } = -1;
+
+        private const int RandomIV = -1;
+
+        public bool IsIVsCompatible(int[] encounterIV, int gen)
+        {
+            var IVs = encounterIV;
+            if (!ivCanMatch(IV_HP , IVs[0])) return false;
+            if (!ivCanMatch(IV_ATK, IVs[1])) return false;
+            if (!ivCanMatch(IV_DEF, IVs[2])) return false;
+            if (!ivCanMatch(IV_SPE, IVs[3])) return false;
+            if (!ivCanMatch(IV_SPA, IVs[4])) return false;
+            if (!ivCanMatch(IV_SPD, IVs[5])) return false;
+
+            bool ivCanMatch(int spec, int enc)
+            {
+                if (spec >= 30 && gen >= 6) // hyper training possible
+                    return true;
+                return enc == RandomIV || spec == enc;
+            }
+
+            return true;
+        }
+
+        public static EncounterCriteria GetCriteria(ShowdownSet s)
+        {
+            int gender = s.Gender == null ? -1 : PKX.GetGenderFromString(s.Gender);
+            return new EncounterCriteria
+            {
+                Gender = gender,
+                Ability = s.Ability,
+                IV_HP = s.IVs[0],
+                IV_ATK = s.IVs[1],
+                IV_DEF = s.IVs[2],
+                IV_SPE = s.IVs[3],
+                IV_SPA = s.IVs[4],
+                IV_SPD = s.IVs[5],
+                HPType = s.HiddenPowerType,
+
+                Nature = (Nature)s.Nature,
+                Shiny = s.Shiny ? Shiny.Always : Shiny.Never,
+            };
+        }
+
+        public Nature GetNature(Nature encValue)
+        {
+            if (encValue != Nature.Random)
+                return encValue;
+            if (Nature != Nature.Random)
+                return Nature;
+            return (Nature)Util.Rand.Next(25);
+        }
+
+        public int GetGender(int gender, PersonalInfo pkPersonalInfo)
+        {
+            if (gender >= 0)
+                return gender;
+            if (!pkPersonalInfo.IsDualGender)
+                return pkPersonalInfo.FixedGender;
+            if (Gender >= 0)
+                return Gender;
+            return pkPersonalInfo.RandomGender;
+        }
+    }
+}
diff --git a/PKHeX.Core/Legality/Enums/SlotType.cs b/PKHeX.Core/Legality/Enums/SlotType.cs
index d2036a33e..a8234f878 100644
--- a/PKHeX.Core/Legality/Enums/SlotType.cs
+++ b/PKHeX.Core/Legality/Enums/SlotType.cs
@@ -132,5 +132,14 @@ namespace PKHeX.Core
         {
             return !(t.IsFishingRodType() || (t & SlotType.Rock_Smash) != 0);
         }
+
+        public static Ball GetBall(this SlotType t)
+        {
+            if (t == SlotType.BugContest)
+                return Ball.Sport;
+            if (t.IsSafariType())
+                return Ball.Safari;
+            return Ball.Poke;
+        }
     }
 }
diff --git a/PKHeX.Core/PersonalInfo/PersonalInfo.cs b/PKHeX.Core/PersonalInfo/PersonalInfo.cs
index 40668f8a2..26cac3246 100644
--- a/PKHeX.Core/PersonalInfo/PersonalInfo.cs
+++ b/PKHeX.Core/PersonalInfo/PersonalInfo.cs
@@ -294,6 +294,17 @@ namespace PKHeX.Core
         /// Gets a random valid gender for the entry.
         /// </summary>
         public int RandomGender
+        {
+            get
+            {
+                var fix = FixedGender;
+                return fix >= 0 ? fix : Util.Rand.Next(2);
+            }
+        }
+
+        public bool IsDualGender => FixedGender < 0;
+
+        public int FixedGender
         {
             get
             {
@@ -303,7 +314,7 @@ namespace PKHeX.Core
                     return 1;
                 if (OnlyMale)
                     return 0;
-                return Util.Rand.Next(2);
+                return -1;
             }
         }