diff --git a/src/pokemon.c b/src/pokemon.c
index 2b8f4fc95f..ef8e7e9e05 100644
--- a/src/pokemon.c
+++ b/src/pokemon.c
@@ -5877,16 +5877,11 @@ u16 ModifyStatByNature(u8 nature, u16 stat, u8 statIndex)
     return retVal;
 }
 
-#define IS_LEAGUE_BATTLE                                                                \
-    ((gBattleTypeFlags & BATTLE_TYPE_TRAINER)                                           \
-    && (gTrainers[gTrainerBattleOpponent_A].trainerClass == TRAINER_CLASS_ELITE_FOUR    \
-     || gTrainers[gTrainerBattleOpponent_A].trainerClass == TRAINER_CLASS_LEADER        \
-     || gTrainers[gTrainerBattleOpponent_A].trainerClass == TRAINER_CLASS_CHAMPION))    \
-
 void AdjustFriendship(struct Pokemon *mon, u8 event)
 {
     u16 species, heldItem;
     u8 holdEffect;
+    s8 mod;
 
     if (ShouldSkipFriendshipChange())
         return;
@@ -5916,26 +5911,43 @@ void AdjustFriendship(struct Pokemon *mon, u8 event)
         if (friendship > 199)
             friendshipLevel++;
 
-        if ((event != FRIENDSHIP_EVENT_WALKING || !(Random() & 1))
-         && (event != FRIENDSHIP_EVENT_LEAGUE_BATTLE || IS_LEAGUE_BATTLE))
+        if (event == FRIENDSHIP_EVENT_WALKING)
         {
-            s8 mod = sFriendshipEventModifiers[event][friendshipLevel];
-            if (mod > 0 && holdEffect == HOLD_EFFECT_FRIENDSHIP_UP)
-                mod = (150 * mod) / 100;
-            friendship += mod;
-            if (mod > 0)
-            {
-                if (GetMonData(mon, MON_DATA_POKEBALL, 0) == ITEM_LUXURY_BALL)
-                    friendship++;
-                if (GetMonData(mon, MON_DATA_MET_LOCATION, 0) == GetCurrentRegionMapSectionId())
-                    friendship++;
-            }
-            if (friendship < 0)
-                friendship = 0;
-            if (friendship > MAX_FRIENDSHIP)
-                friendship = MAX_FRIENDSHIP;
-            SetMonData(mon, MON_DATA_FRIENDSHIP, &friendship);
+            // 50% chance every 128 steps
+            if (Random() & 1)
+                return;
         }
+        if (event == FRIENDSHIP_EVENT_LEAGUE_BATTLE)
+        {
+            // Only if it's a trainer battle with league progression significance
+            if (!(gBattleTypeFlags & BATTLE_TYPE_TRAINER))
+                return;
+            if (!(gTrainers[gTrainerBattleOpponent_A].trainerClass == TRAINER_CLASS_LEADER
+                || gTrainers[gTrainerBattleOpponent_A].trainerClass == TRAINER_CLASS_ELITE_FOUR
+                || gTrainers[gTrainerBattleOpponent_A].trainerClass == TRAINER_CLASS_CHAMPION))
+                return;
+        }
+
+        mod = sFriendshipEventModifiers[event][friendshipLevel];
+        if (mod > 0 && holdEffect == HOLD_EFFECT_FRIENDSHIP_UP)
+            // 50% increase, rounding down
+            mod = (150 * mod) / 100;
+
+        friendship += mod;
+        if (mod > 0)
+        {
+            if (GetMonData(mon, MON_DATA_POKEBALL, NULL) == ITEM_LUXURY_BALL)
+                friendship++;
+            if (GetMonData(mon, MON_DATA_MET_LOCATION, NULL) == GetCurrentRegionMapSectionId())
+                friendship++;
+        }
+
+        if (friendship < 0)
+            friendship = 0;
+        if (friendship > MAX_FRIENDSHIP)
+            friendship = MAX_FRIENDSHIP;
+
+        SetMonData(mon, MON_DATA_FRIENDSHIP, &friendship);
     }
 }