diff --git a/data/battle_scripts_1.s b/data/battle_scripts_1.s
index aae89225d0..d1556c2b8e 100644
--- a/data/battle_scripts_1.s
+++ b/data/battle_scripts_1.s
@@ -5941,6 +5941,7 @@ BattleScript_PayDayMoneyAndPickUpItems::
 	end2
 
 BattleScript_LocalBattleLost::
+	jumpifbattletype BATTLE_TYPE_INGAME_PARTNER, BattleScript_LocalBattleLostPrintWhiteOut
 	jumpifbattletype BATTLE_TYPE_DOME, BattleScript_CheckDomeDrew
 	jumpifbattletype BATTLE_TYPE_FRONTIER, BattleScript_LocalBattleLostPrintTrainersWinText
 	jumpifbattletype BATTLE_TYPE_TRAINER_HILL, BattleScript_LocalBattleLostPrintTrainersWinText
diff --git a/include/constants/battle_config.h b/include/constants/battle_config.h
index 2f4bb65c2c..facd4f4019 100644
--- a/include/constants/battle_config.h
+++ b/include/constants/battle_config.h
@@ -232,8 +232,9 @@
 #define B_LAST_USED_BALL            TRUE     // If TRUE, the "last used ball" feature from Gen 7 will be implemented
 #define B_LAST_USED_BALL_BUTTON     R_BUTTON // If last used ball is implemented, this button (or button combo) will trigger throwing the last used ball.
 
-// Other
+// 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.
 
 // Animation Settings
 #define B_NEW_SWORD_PARTICLE            FALSE    // If set to TRUE, it updates Swords Dance's particle.
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index 857a4d819c..eee5ccf03f 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -3942,7 +3942,8 @@ static void Cmd_getexp(void)
                 gBattleScripting.getexpState = 5;
                 gBattleMoveDamage = 0; // used for exp
             }
-            else if (GetMonData(&gPlayerParty[gBattleStruct->expGetterMonId], MON_DATA_LEVEL) == MAX_LEVEL)
+            else if ((gBattleTypeFlags & BATTLE_TYPE_INGAME_PARTNER && gBattleStruct->expGetterMonId >= 3)
+                  || GetMonData(&gPlayerParty[gBattleStruct->expGetterMonId], MON_DATA_LEVEL) == MAX_LEVEL)
             {
                 *(&gBattleStruct->sentInPokes) >>= 1;
                 gBattleScripting.getexpState = 5;
@@ -4134,6 +4135,28 @@ static void Cmd_getexp(void)
     }
 }
 
+#ifdef B_MULTI_BATTLE_WHITEOUT >= GEN_4
+static bool32 NoAliveMonsForPlayerAndPartner(void)
+{
+    u32 i;
+    u32 HP_count = 0;
+
+    if (gBattleTypeFlags & BATTLE_TYPE_INGAME_PARTNER && (gPartnerTrainerId == TRAINER_STEVEN_PARTNER || gPartnerTrainerId >= TRAINER_CUSTOM_PARTNER))
+    {
+        for (i = 0; i < PARTY_SIZE; i++)
+        {
+            if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) && !GetMonData(&gPlayerParty[i], MON_DATA_IS_EGG)
+             && (!(gBattleTypeFlags & BATTLE_TYPE_ARENA) || !(gBattleStruct->arenaLostPlayerMons & gBitTable[i])))
+            {
+                HP_count += GetMonData(&gPlayerParty[i], MON_DATA_HP);
+            }
+        }
+    }
+
+    return (HP_count == 0);
+}
+#endif
+
 static bool32 NoAliveMonsForPlayer(void)
 {
     u32 i;
@@ -4195,8 +4218,21 @@ static void Cmd_checkteamslost(void)
     if (gBattleControllerExecFlags)
         return;
 
+#ifdef B_MULTI_BATTLE_WHITEOUT >= GEN_4
+    if (gBattleTypeFlags & (BATTLE_TYPE_MULTI | BATTLE_TYPE_INGAME_PARTNER))
+    {
+        if (NoAliveMonsForPlayerAndPartner())
+            gBattleOutcome |= B_OUTCOME_LOST;
+    }
+    else
+    {
+        if (NoAliveMonsForPlayer())
+            gBattleOutcome |= B_OUTCOME_LOST;
+    }
+#else
     if (NoAliveMonsForPlayer())
         gBattleOutcome |= B_OUTCOME_LOST;
+#endif
     if (NoAliveMonsForOpponent())
         gBattleOutcome |= B_OUTCOME_WON;