diff --git a/PKHeX.Core/Legality/Verifiers/Ability/AbilityBreedLegality.cs b/PKHeX.Core/Legality/Verifiers/Ability/AbilityBreedLegality.cs
index f7ea8f6e5..aaf09259e 100644
--- a/PKHeX.Core/Legality/Verifiers/Ability/AbilityBreedLegality.cs
+++ b/PKHeX.Core/Legality/Verifiers/Ability/AbilityBreedLegality.cs
@@ -148,5 +148,25 @@ namespace PKHeX.Core
         // Species that cannot be bred with a Hidden Ability originating in <see cref="GameVersion.Gen8"/>
         // </summary>
         // internal static readonly HashSet<int> BanHidden8 = new(); // none as of DLC 1!
+
+        /// <summary>
+        /// Species that cannot be bred with a Hidden Ability originating in <see cref="GameVersion.Gen7"/>
+        /// </summary>
+        internal static readonly HashSet<int> BanHidden8b = new()
+        {
+            (int)Rotom,
+            (int)Rotom + (1 << 11),
+            (int)Rotom + (2 << 11),
+            (int)Rotom + (3 << 11),
+            (int)Rotom + (4 << 11),
+            (int)Rotom + (5 << 11),
+
+            (int)Baltoy,
+            (int)Claydol,
+            (int)Solrock,
+            (int)Lunatone,
+
+            (int)Phione,
+        };
     }
 }
diff --git a/PKHeX.Core/Legality/Verifiers/Ability/AbilityVerifier.cs b/PKHeX.Core/Legality/Verifiers/Ability/AbilityVerifier.cs
index 385db4bfc..3f91a65d2 100644
--- a/PKHeX.Core/Legality/Verifiers/Ability/AbilityVerifier.cs
+++ b/PKHeX.Core/Legality/Verifiers/Ability/AbilityVerifier.cs
@@ -127,6 +127,7 @@ namespace PKHeX.Core
                 5 => VerifyAbility5(data, enc, abilities),
                 6 => VerifyAbility6(data, enc),
                 7 => VerifyAbility7(data, enc),
+                8 when data.pkm.BDSP => VerifyAbility8BDSP(data, enc),
               >=8 => VALID,
                 _ => CheckMatch(data.pkm, abilities, gen, AbilityState.CanMismatch, enc),
             };
@@ -340,7 +341,6 @@ namespace PKHeX.Core
             // Eggs and Encounter Slots are not yet checked for Hidden Ability potential.
             return enc switch
             {
-                EncounterSlot5 w when pkm.AbilityNumber == 4 != w.IsHiddenGrotto => GetInvalid(w.IsHiddenGrotto ? LAbilityMismatchGrotto : LAbilityHiddenFail),
                 EncounterEgg e when pkm.AbilityNumber == 4 && AbilityBreedLegality.BanHidden5.Contains(e.Species) => GetInvalid(LAbilityHiddenUnavailable),
                 _ => CheckMatch(data.pkm, abilities, 5, pkm.Format == 5 ? AbilityState.MustMatch : AbilityState.CanMismatch, enc),
             };
@@ -355,12 +355,6 @@ namespace PKHeX.Core
             // Eggs and Encounter Slots are not yet checked for Hidden Ability potential.
             return enc switch
             {
-                EncounterSlot6XY {IsFriendSafari: true} => VALID,
-                EncounterSlot6XY {IsHorde: true} => VALID,
-                EncounterSlot6AO {IsHorde: true} => VALID,
-                EncounterSlot6AO {CanDexNav: true} => VALID,
-                EncounterSlot => GetInvalid(LAbilityMismatchHordeSafari),
-
                 EncounterEgg egg when AbilityBreedLegality.BanHidden6.Contains(egg.Species | (egg.Form << 11)) => GetInvalid(LAbilityHiddenUnavailable),
                 _ => VALID,
             };
@@ -374,12 +368,24 @@ namespace PKHeX.Core
 
             return enc switch
             {
-                EncounterSlot7 {IsSOS: false} => GetInvalid(LAbilityMismatchSOS),
                 EncounterEgg egg when AbilityBreedLegality.BanHidden7.Contains(egg.Species | (egg.Form << 11)) => GetInvalid(LAbilityHiddenUnavailable),
                 _ => VALID,
             };
         }
 
+        private CheckResult VerifyAbility8BDSP(LegalityAnalysis data, IEncounterable enc)
+        {
+            var pkm = data.pkm;
+            if (pkm.AbilityNumber != 4)
+                return VALID;
+
+            return enc switch
+            {
+                EncounterEgg egg when AbilityBreedLegality.BanHidden8b.Contains(egg.Species | (egg.Form << 11)) => GetInvalid(LAbilityHiddenUnavailable),
+                _ => VALID,
+            };
+        }
+
         /// <summary>
         /// Final checks assuming nothing else has flagged the ability.
         /// </summary>