Fill empty ability values with ability1

update handling that checked for this case to instead check for
equivalence to ability1 instead of 0

was generating a PGF with ability[1] = 0, which is not correct. Just fix
the binaries to behave and get rid of all the workarounds since future
tables don't have missing values.

PKHeX.Core/Legality/Checks.cs

@@ -1098,8 +1098,6 @@ private void VerifyCXDStarterCorrelation(PIDIV pidiv)
         private void VerifyAbility()
         {
             int[] abilities = pkm.PersonalInfo.Abilities;
-            if (abilities[1] == 0)
-                abilities[1] = abilities[0];
             int abilval = Array.IndexOf(abilities, pkm.Ability);
             if (abilval < 0)
             {
@@ -1226,8 +1224,8 @@ private static bool IsAbilityCapsuleModified(PKM pkm, IReadOnlyList<int> abiliti
         }
         private bool? VerifyAbilityGen3Transfer(int[] abilities, int abilval, int Species_g3)
         {
-            var abilities_g3 = PersonalTable.E[Species_g3].Abilities.Where(a => a != 0).Distinct().ToArray();
-            if (abilities_g3.Length == 2) // Excluding Colosseum/XD, a gen3 pkm must match PID if it has 2 unique abilities
+            var pers = (PersonalInfoG3)PersonalTable.E[Species_g3];
+            if (pers.Ability1 != pers.Ability2) // Excluding Colosseum/XD, a gen3 pkm must match PID if it has 2 unique abilities
                 return pkm.Version != (int)GameVersion.CXD;
 
             int Species_g4 = Info.EvoChainsAllGens[4].FirstOrDefault()?.Species ?? 0;
@@ -1239,7 +1237,7 @@ private static bool IsAbilityCapsuleModified(PKM pkm, IReadOnlyList<int> abiliti
             if (Evolutions_g45 > 1)
             {
                 // Evolutions_g45 > 1 and Species_g45 = Species_g3 with means both options, evolve in gen 4-5 or not evolve, are possible
-                if (pkm.Ability == abilities_g3[0])
+                if (pkm.Ability == pers.Ability1)
                     // It could evolve in gen 4-5 an have generation 3 only ability
                     // that means it have not actually evolved in gen 4-5, ability do not need to match PID
                     return null;
@@ -1250,7 +1248,7 @@ private static bool IsAbilityCapsuleModified(PKM pkm, IReadOnlyList<int> abiliti
             }
             // Evolutions_g45 == 1 means it have not evolved in gen 4-5 games,
             // ability do not need to match PID, but only generation 3 ability is allowed
-            if (pkm.Ability != abilities_g3[0])
+            if (pkm.Ability != pers.Ability1)
                 // Not evolved in gen4-5 but do not have generation 3 only ability
                 AddLine(Severity.Invalid, V373, CheckIdentifier.Ability);
             return null;

PKHeX.Core/Legality/Encounters/Data/Encounters5.cs

@@ -90,8 +90,9 @@ private static void MarkG5DreamWorld(ref EncounterStatic[] t)
         {
             foreach (EncounterStatic s in t)
             {
-                s.Location = 75;  //Entree Forest
-                s.Ability = PersonalTable.B2W2.GetAbilities(s.Species, s.Form)[2] == 0 ? 1 : 4; // Check if has HA
+                s.Location = 75; // Entree Forest
+                var p = (PersonalInfoBW)PersonalTable.B2W2[s.Species];
+                s.Ability = p.HasHiddenAbility ? 4 : 1;
                 s.Shiny = Shiny.Never;
             }
 

PKHeX.Core/PKM/PKM.cs

@@ -668,7 +668,7 @@ public void RefreshAbility(int n)
             int[] abilities = PersonalInfo.Abilities;
             if (n < abilities.Length)
             {
-                if (abilities[n] == 0)
+                if (abilities[n] == abilities[0])
                     n = 0;
                 Ability = abilities[n];
             }

PKHeX.Core/PKM/Shared/_K3.cs

@@ -26,7 +26,7 @@ public abstract class _K3 : PKM, IRibbonSetEvent3, IRibbonSetCommon3, IRibbonSet
         public override bool WasGiftEgg => IsEgg && Met_Location == 253; // Gift Egg, indistinguible from normal eggs after hatch
         public override bool WasEventEgg => IsEgg && Met_Location == 255; // Event Egg, indistinguible from normal eggs after hatch
 
-        public override int Ability { get { int[] abils = PersonalInfo.Abilities; return abils[abils[1] == 0 ? 0 : AbilityNumber >> 1]; } set { } }
+        public override int Ability { get { var pi = (PersonalInfoG3)PersonalInfo; return pi.Abilities[pi.HasSecondAbility ? AbilityNumber >> 1 : 0]; } set { } }
         public override uint EncryptionConstant { get => PID; set { } }
         public override int Nature { get => (int)(PID % 25); set { } }
         public override int AltForm { get => Species == 201 ? PKX.GetUnownForm(PID) : 0; set { } }

PKHeX.Core/PersonalInfo/PersonalInfoBW.cs

@@ -86,5 +86,7 @@ public override int[] Abilities
                 AbilityH = (byte)value[2];
             }
         }
+
+        public bool HasHiddenAbility => AbilityH != Ability1;
     }
 }

PKHeX.Core/PersonalInfo/PersonalInfoG3.cs

@@ -69,5 +69,7 @@ public override int[] Abilities
                 Ability2 = (byte)value[1];
             }
         }
+
+        public bool HasSecondAbility => Ability1 != Ability2;
     }
 }

PKHeX.WinForms/Controls/PKM Editor/LoadSave.cs

@@ -355,7 +355,7 @@ private static int GetAbilityIndex4(PKM pk, int[] abils)
                 return 0;
             if (abilityIndex >= 2)
                 return 2;
-            if (abils[0] == abils[1] || abils[1] == 0)
+            if (abils[0] == abils[1])
                 return pk.PIDAbility;
             return abilityIndex;
         }

PKHeX.WinForms/Controls/PKM Editor/PKMEditor.cs

@@ -392,14 +392,10 @@ private void SetAbilityList()
         private static List<ComboItem> GetAbilityList(PKM pkm)
         {
             var abils = pkm.PersonalInfo.Abilities;
-            if (abils[1] == 0 && pkm.Format != 3)
-                abils[1] = abils[0];
+            if (pkm.Format == 3 && abils[1] == abils[0])
+                abils = new[] {abils[0]};
 
-            var list = abils.Where(a => a != 0).Select(GetItem).ToList();
-            if (list.Count == 0)
-                list.Add(GetItem(0, 0));
-
-            return list;
+            return abils.Select(GetItem).ToList();
 
             ComboItem GetItem(int ability, int index) => new ComboItem
             {