Config to restore Gen 3's damage reduction to multi target moves

include/config/battle.h

@@ -30,6 +30,7 @@
 #define B_SPORT_DMG_REDUCTION       GEN_LATEST // In Gen5+, Water/Mud Sport reduce Fire/Electric Damage by 67% instead of 50%.
 #define B_EXPLOSION_DEFENSE         GEN_LATEST // In Gen5+, Self-Destruct and Explosion don't halve the targets' defense.
 #define B_PARENTAL_BOND_DMG         GEN_LATEST // In Gen7+, Parental Bond's second hit does 25% of the initial hits damage. Before, it did 50%.
+#define B_MULTIPLE_TARGETS_DMG      GEN_LATEST // In Gen4+, damage dealt by moves that hit multiple targets at once is reduced to 75%. Before, it was 50%.
 
 // Type settings
 #define B_GHOSTS_ESCAPE             GEN_LATEST // In Gen6+, abilities like Shadow Tag or moves like Mean Look fail on Ghost-type Pokémon. They can also escape any Wild Battle.

src/battle_util.c

@@ -9198,7 +9198,11 @@ static u32 CalcFinalDmg(u32 dmg, u16 move, u8 battlerAtk, u8 battlerDef, u8 move
 
     // check multiple targets in double battle
     if (GetMoveTargetCount(move, battlerAtk, battlerDef) >= 2)
+    #if B_MULTIPLE_TARGETS_DMG >= GEN_4
         MulModifier(&finalModifier, UQ_4_12(0.75));
+    #else
+        MulModifier(&finalModifier, UQ_4_12(0.5));
+    #endif
 
     // take type effectiveness
     MulModifier(&finalModifier, typeEffectivenessModifier);