diff --git a/include/constants/battle_config.h b/include/constants/battle_config.h
index 74eb40f0ef..11cf51770f 100644
--- a/include/constants/battle_config.h
+++ b/include/constants/battle_config.h
@@ -54,6 +54,10 @@
     #define SPECIES_SIRFETCHD                        10021
     #define SPECIES_DARMANITAN_GALARIAN              0
     #define SPECIES_DARMANITAN_ZEN_MODE_GALARIAN     10022
+    #define SPECIES_HEATMOR                          0
+    #define SPECIES_DURANT                           0
+    #define SPECIES_CARBINK                          0
+    #define SPECIES_MAREANIE                         0
 #endif
 
 // Items with peculiar battle effects.
@@ -237,6 +241,7 @@
 // Other settings
 #define B_DOUBLE_WILD_CHANCE        0     // % chance of encountering two Pokémon in a Wild Encounter.
 #define B_MULTI_BATTLE_WHITEOUT     GEN_8 // In Gen4+, multi battles end when the Player and also their Partner don't have any more Pokémon to fight.
+#define B_WILD_NATURAL_ENEMIES      TRUE  // If set to TRUE, certain wild mon species will attack other species when partnered in double wild battles (eg. Zangoose vs Seviper)
 
 // Animation Settings
 #define B_NEW_SWORD_PARTICLE            FALSE    // If set to TRUE, it updates Swords Dance's particle.
diff --git a/src/battle_controller_opponent.c b/src/battle_controller_opponent.c
index 0c4b08620c..08566ebd24 100644
--- a/src/battle_controller_opponent.c
+++ b/src/battle_controller_opponent.c
@@ -1614,7 +1614,42 @@ static void OpponentHandleChooseMove(void)
             if (gBattleMoves[move].target & (MOVE_TARGET_USER_OR_SELECTED | MOVE_TARGET_USER))
                 BtlController_EmitTwoReturnValues(BUFFER_B, 10, (chosenMoveId) | (gActiveBattler << 8));
             else if (gBattleTypeFlags & BATTLE_TYPE_DOUBLE)
-                BtlController_EmitTwoReturnValues(BUFFER_B, 10, (chosenMoveId) | (GetBattlerAtPosition(Random() & 2) << 8));
+            {
+                #if B_WILD_NATURAL_ENEMIES == TRUE
+                // Don't bother to loop through table if the move can't attack ally
+                if (!(gBattleMoves[move].target & MOVE_TARGET_BOTH))
+                {
+                    u16 i, speciesAttacker, speciesTarget, isPartnerEnemy = FALSE;
+                    static const u16 naturalEnemies[][2] =
+                    {
+                        // Attacker         Target
+                        {SPECIES_ZANGOOSE,  SPECIES_SEVIPER},
+                        {SPECIES_SEVIPER,   SPECIES_ZANGOOSE},
+                        {SPECIES_HEATMOR,   SPECIES_DURANT},
+                        {SPECIES_DURANT,    SPECIES_HEATMOR},
+                        {SPECIES_SABLEYE,   SPECIES_CARBINK},
+                        {SPECIES_MAREANIE,  SPECIES_CORSOLA},
+                    };
+                    speciesAttacker = gBattleMons[gActiveBattler].species;
+                    speciesTarget = gBattleMons[GetBattlerAtPosition(BATTLE_PARTNER(gActiveBattler))].species;
+
+                    for (i = 0; i < ARRAY_COUNT(naturalEnemies); i++)
+                    {
+                        if (speciesAttacker == naturalEnemies[i][0] && speciesTarget == naturalEnemies[i][1])
+                        {
+                            isPartnerEnemy = TRUE;
+                            break;
+                        }
+                    }
+                    if (isPartnerEnemy)
+                        BtlController_EmitTwoReturnValues(BUFFER_B, 10, (chosenMoveId) | (GetBattlerAtPosition(BATTLE_PARTNER(gActiveBattler)) << 8));
+                    else
+                        BtlController_EmitTwoReturnValues(BUFFER_B, 10, (chosenMoveId) | (GetBattlerAtPosition(Random() & 2) << 8));
+                }
+                else
+                #endif
+                    BtlController_EmitTwoReturnValues(BUFFER_B, 10, (chosenMoveId) | (GetBattlerAtPosition(Random() & 2) << 8));
+            }
             else
                 BtlController_EmitTwoReturnValues(BUFFER_B, 10, (chosenMoveId) | (GetBattlerAtPosition(B_POSITION_PLAYER_LEFT) << 8));