diff --git a/CHANGELOG.md b/CHANGELOG.md
index 393eca81c..9d599aaf3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,8 +36,6 @@
 * Fixed Last Resort not counting Sleep Talk as used for its effect by @DizzyEggg in https://github.com/rh-hideout/pokeemerald-expansion/pull/3378
 
 ## 🎭 Abilities 🎭
-### Added
-* Added config for Synchronize's Gen9 behaviour (as in, not working at all) by @Bassoonian in https://github.com/rh-hideout/pokeemerald-expansion/pull/3455
 ### Changed
 * Removed unused `STATUS3_CANT_SCORE_A_CRIT` by @AlexOn1ine in https://github.com/rh-hideout/pokeemerald-expansion/pull/3377
 * Moved Beads of Ruin and Sword of Ruin damage to the appropiate damage modifier functions by @kittenchilly in https://github.com/rh-hideout/pokeemerald-expansion/pull/3415
diff --git a/include/config/battle.h b/include/config/battle.h
index 5ce2e4f9f..2278d7fea 100644
--- a/include/config/battle.h
+++ b/include/config/battle.h
@@ -115,7 +115,7 @@
 #define B_SHADOW_TAG_ESCAPE         GEN_LATEST // In Gen4+, if both sides have a Pokémon with Shadow Tag, all battlers can escape. Before, neither side could escape this situation.
 #define B_MOODY_ACC_EVASION         GEN_LATEST // In Gen8, Moody CANNOT raise Accuracy and Evasion anymore.
 #define B_FLASH_FIRE_FROZEN         GEN_LATEST // In Gen5+, Flash Fire can trigger even when frozen, when it couldn't before.
-#define B_SYNCHRONIZE_NATURE        GEN_LATEST // In Gen8, if a Pokémon with Synchronize is leading the party, it's 100% guaranteed that wild Pokémon will have the same Nature, as opposed to 50% previously. In Gen9, it has no out-of-battle effect.
+#define B_SYNCHRONIZE_NATURE        GEN_LATEST // In Gen8, if a Pokémon with Synchronize is leading the party, it's 100% guaranteed that wild Pokémon will have the same Nature, as opposed to 50% previously.
 #define B_SYNCHRONIZE_TOXIC         GEN_LATEST // In Gen5+, if a Pokémon with Synchronize is badly poisoned, the opponent will also become badly poisoned. Previously, the opponent would become regular poisoned.
 #define B_UPDATED_INTIMIDATE        GEN_LATEST // In Gen8, Intimidate doesn't work on opponents with the Inner Focus, Scrappy, Own Tempo or Oblivious abilities. It also activates Rattled.
 #define B_OBLIVIOUS_TAUNT           GEN_LATEST // In Gen6+, Pokémon with Oblivious can't be taunted.
diff --git a/src/wild_encounter.c b/src/wild_encounter.c
index 5ea88f4c4..6016e08e6 100644
--- a/src/wild_encounter.c
+++ b/src/wild_encounter.c
@@ -415,7 +415,6 @@ static u8 PickWildMonNature(void)
             }
         }
     }
-#if B_SYNCHRONIZE_NATURE < GEN_9
     // check synchronize for a pokemon with the same ability
     if (!GetMonData(&gPlayerParty[0], MON_DATA_SANITY_IS_EGG)
         && GetMonAbility(&gPlayerParty[0]) == ABILITY_SYNCHRONIZE
@@ -426,7 +425,6 @@ static u8 PickWildMonNature(void)
     {
         return GetMonData(&gPlayerParty[0], MON_DATA_PERSONALITY) % NUM_NATURES;
     }
-#endif
 
     // random nature
     return Random() % NUM_NATURES;