Fixes Synchronize's OW effect and adds configs

include/config/battle.h

@@ -117,7 +117,6 @@
 #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_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.

include/config/overworld.h

@@ -10,6 +10,20 @@
 // PC settings
 #define OW_PC_PRESS_B               GEN_LATEST // In Gen4, pressing B when holding a Pokémon is equivalent to placing it. In Gen3, it gives the "You're holding a Pokémon!" error.
 
+// Out-of-battle Ability effects
+#define OW_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. Stationary Pokémon are excluded in Gen3. In Gen6, all No Eggs Discovered gift Pokémon will have the same Nature, while in Gen7 all gift Pokémon will, regardless of Egg Group - In Gen 8, no gift Pokémon are affected. In Gen9, this ability has no out-of-battle effect.
+#define OW_COMPOUND_EYES            GEN_LATEST // Prior to Gen9, if a Pokémon with Compound Eyes is leading the party, the wild held item rate is increased to 60%/20%.
+#define OW_SUPER_LUCK               GEN_LATEST // In Gen8, if a Pokémon with Super Luck is leading the party, the wild held item rate is increased to 60%/20%.
+#define OW_CUTE_CHARM               GEN_LATEST // Prior to Gen9, if a Pokémon with Cute Charm is leading the party, wild encounters have a 66.7% chance to be forced to be of the opposite gender.
+#define OW_ILLUMINATE               GEN_LATEST // Prior to Gen9, if a Pokémon with Illuminate is leading the party, the wild encounter rate is doubled.
+#define OW_INFILTRATOR              GEN_LATEST // In Gen8, if a Pokémon with Infiltrator is leading the party, the wild encounter rate is halved.
+#define OW_HARVEST                  GEN_LATEST // In Gen8, if a Pokémon with Harvest is leading the party, there is a 50% chance to encounter a Grass-type Pokémon.
+#define OW_LIGHTNING_ROD            GEN_LATEST // In Gen8, if a Pokémon with Lightning Rod is leading the party, there is a 50% chance to encounter an Electric-type Pokémon.
+#define OW_STORM_DRAIN              GEN_LATEST // In Gen8, if a Pokémon with Storm Drain is leading the party, there is a 50% chance to encounter a Water-type Pokémon.
+#define OW_FLASH_FIRE               GEN_LATEST // In Gen8, if a Pokémon with Flash Fire is leading the party, there is a 50% chance to encounter a Fire-type Pokémon.
+#define OW_MAGNET_PULL              GEN_LATEST // Prior to Gen9, if a Pokémon with Magnet Pull is leading the party, there is a 50% chance to encounter a Steel-type Pokémon.
+#define OW_STATIC                   GEN_LATEST // Prior to Gen9, if a Pokémon with Static is leading the party, there is a 50% chance to encounter an Electric-type Pokémon.
+
 // Overworld flags
 // To use the following features in scripting, replace the 0s with the flag ID you're assigning it to.
 // Eg: Replace with FLAG_UNUSED_0x264 so you can use that flag to toggle the feature.

include/wild_encounter.h

@@ -31,6 +31,7 @@ extern bool8 gIsFishingEncounter;
 extern bool8 gIsSurfingEncounter;
 
 void DisableWildEncounters(bool8 disabled);
+u8 PickWildMonNature(void);
 bool8 StandardWildEncounter(u16 currMetaTileBehavior, u16 previousMetaTileBehavior);
 bool8 SweetScentWildEncounter(void);
 bool8 DoesCurrentMapHaveFishingMons(void);

src/pokemon.c

@@ -8070,29 +8070,33 @@ static s32 GetWildMonTableIdInAlteringCave(u16 species)
     return 0;
 }
 
+static inline bool32 CanFirstMonBoostHeldItemRarity(void)
+{
+    if (GetMonData(&gPlayerParty[0], MON_DATA_SANITY_IS_EGG))
+        return FALSE;
+    else if ((OW_COMPOUND_EYES < GEN_9) && GetMonAbility(&gPlayerParty[0]) == ABILITY_COMPOUND_EYES)
+        return TRUE;
+    else if ((OW_SUPER_LUCK == GEN_8) && GetMonAbility(&gPlayerParty[0]) == ABILITY_SUPER_LUCK)
+        return TRUE;
+    return FALSE;
+}
+
 void SetWildMonHeldItem(void)
 {
     if (!(gBattleTypeFlags & (BATTLE_TYPE_LEGENDARY | BATTLE_TYPE_TRAINER | BATTLE_TYPE_PYRAMID | BATTLE_TYPE_PIKE)))
     {
         u16 rnd;
         u16 species;
-        u16 chanceNoItem = 45;
-        u16 chanceNotRare = 95;
         u16 count = (WILD_DOUBLE_BATTLE) ? 2 : 1;
         u16 i;
-
-        if (!GetMonData(&gPlayerParty[0], MON_DATA_SANITY_IS_EGG, 0)
-            && (GetMonAbility(&gPlayerParty[0]) == ABILITY_COMPOUND_EYES
-                || GetMonAbility(&gPlayerParty[0]) == ABILITY_SUPER_LUCK))
-        {
-            chanceNoItem = 20;
-            chanceNotRare = 80;
-        }
+        bool32 itemHeldBoost = CanFirstMonBoostHeldItemRarity();
+        u16 chanceNoItem = itemHeldBoost ? 20 : 45;
+        u16 chanceNotRare = itemHeldBoost ? 80 : 95;
 
         for (i = 0; i < count; i++)
         {
             if (GetMonData(&gEnemyParty[i], MON_DATA_HELD_ITEM, NULL) != ITEM_NONE)
-                continue; // prevent ovewriting previously set item
+                continue; // prevent overwriting previously set item
 
             rnd = Random() % 100;
             species = GetMonData(&gEnemyParty[i], MON_DATA_SPECIES, 0);

src/script_pokemon_util.c

@@ -21,6 +21,7 @@
 #include "sprite.h"
 #include "string_util.h"
 #include "tv.h"
+#include "wild_encounter.h"
 #include "constants/items.h"
 #include "constants/battle_frontier.h"
 
@@ -66,7 +67,11 @@ u8 ScriptGiveMon(u16 species, u8 level, u16 item, u32 unused1, u32 unused2, u8 u
     struct Pokemon mon;
     u16 targetSpecies;
 
-    CreateMon(&mon, species, level, USE_RANDOM_IVS, FALSE, 0, OT_ID_PLAYER_ID, 0);
+    if (OW_SYNCHRONIZE_NATURE >= GEN_6 && (gSpeciesInfo[species].eggGroups[0] == EGG_GROUP_UNDISCOVERED || OW_SYNCHRONIZE_NATURE == GEN_7))
+        CreateMonWithNature(&mon, species, level, USE_RANDOM_IVS, PickWildMonNature());
+    else
+        CreateMon(&mon, species, level, USE_RANDOM_IVS, FALSE, 0, OT_ID_PLAYER_ID, 0);
+
     heldItem[0] = item;
     heldItem[1] = item >> 8;
     SetMonData(&mon, MON_DATA_HELD_ITEM, heldItem);
@@ -149,7 +154,10 @@ void CreateScriptedWildMon(u16 species, u8 level, u16 item)
     u8 heldItem[2];
 
     ZeroEnemyPartyMons();
-    CreateMon(&gEnemyParty[0], species, level, USE_RANDOM_IVS, 0, 0, OT_ID_PLAYER_ID, 0);
+    if (OW_SYNCHRONIZE_NATURE > GEN_3)
+        CreateMonWithNature(&gEnemyParty[0], species, level, USE_RANDOM_IVS, PickWildMonNature());
+    else
+        CreateMon(&gEnemyParty[0], species, level, USE_RANDOM_IVS, 0, 0, OT_ID_PLAYER_ID, 0);
     if (item)
     {
         heldItem[0] = item;
@@ -164,15 +172,21 @@ void CreateScriptedDoubleWildMon(u16 species1, u8 level1, u16 item1, u16 species
 
     ZeroEnemyPartyMons();
 
-    CreateMon(&gEnemyParty[0], species1, level1, 32, 0, 0, OT_ID_PLAYER_ID, 0);
+    if (OW_SYNCHRONIZE_NATURE > GEN_3)
+        CreateMonWithNature(&gEnemyParty[0], species1, level1, 32, PickWildMonNature());
+    else
+        CreateMon(&gEnemyParty[0], species1, level1, 32, 0, 0, OT_ID_PLAYER_ID, 0);
     if (item1)
     {
         heldItem1[0] = item1;
         heldItem1[1] = item1 >> 8;
         SetMonData(&gEnemyParty[0], MON_DATA_HELD_ITEM, heldItem1);
     }
 
-    CreateMon(&gEnemyParty[1], species2, level2, 32, 0, 0, OT_ID_PLAYER_ID, 0);
+    if (OW_SYNCHRONIZE_NATURE > GEN_3)
+        CreateMonWithNature(&gEnemyParty[1], species2, level2, 32, PickWildMonNature());
+    else
+        CreateMon(&gEnemyParty[1], species2, level2, 32, 0, 0, OT_ID_PLAYER_ID, 0);
     if (item2)
     {
         heldItem2[0] = item2;

src/wild_encounter.c

@@ -383,7 +383,7 @@ static u16 GetCurrentMapWildMonHeaderId(void)
     return HEADER_NONE;
 }
 
-static u8 PickWildMonNature(void)
+u8 PickWildMonNature(void)
 {
     u8 i;
     u8 j;
@@ -415,15 +415,14 @@ 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)
+    if (OW_SYNCHRONIZE_NATURE < GEN_9
+        && !GetMonData(&gPlayerParty[0], MON_DATA_SANITY_IS_EGG)
         && GetMonAbility(&gPlayerParty[0]) == ABILITY_SYNCHRONIZE
-        && (B_SYNCHRONIZE_NATURE >= GEN_8 || Random() % 2 == 0))
+        && (OW_SYNCHRONIZE_NATURE == GEN_8 || Random() % 2 == 0))
     {
         return GetMonData(&gPlayerParty[0], MON_DATA_PERSONALITY) % NUM_NATURES;
     }
-#endif
 
     // random nature
     return Random() % NUM_NATURES;
@@ -434,7 +433,7 @@ static void CreateWildMon(u16 species, u8 level)
     bool32 checkCuteCharm;
 
     ZeroEnemyPartyMons();
-    checkCuteCharm = TRUE;
+    checkCuteCharm = OW_CUTE_CHARM < GEN_9;
 
     switch (gSpeciesInfo[species].genderRatio)
     {
@@ -480,33 +479,33 @@ static bool8 TryGenerateWildMon(const struct WildPokemonInfo *wildMonInfo, u8 ar
     switch (area)
     {
     case WILD_AREA_LAND:
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_STEEL, ABILITY_MAGNET_PULL, &wildMonIndex, LAND_WILD_COUNT))
+        if (OW_MAGNET_PULL < GEN_9 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_STEEL, ABILITY_MAGNET_PULL, &wildMonIndex, LAND_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_ELECTRIC, ABILITY_STATIC, &wildMonIndex, LAND_WILD_COUNT))
+        if (OW_STATIC < GEN_9 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_ELECTRIC, ABILITY_STATIC, &wildMonIndex, LAND_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_ELECTRIC, ABILITY_LIGHTNING_ROD, &wildMonIndex, LAND_WILD_COUNT))
+        if (OW_LIGHTNING_ROD == GEN_8 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_ELECTRIC, ABILITY_LIGHTNING_ROD, &wildMonIndex, LAND_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_FIRE, ABILITY_FLASH_FIRE, &wildMonIndex, LAND_WILD_COUNT))
+        if (OW_FLASH_FIRE == GEN_8 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_FIRE, ABILITY_FLASH_FIRE, &wildMonIndex, LAND_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_GRASS, ABILITY_HARVEST, &wildMonIndex, LAND_WILD_COUNT))
+        if (OW_HARVEST == GEN_8 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_GRASS, ABILITY_HARVEST, &wildMonIndex, LAND_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_WATER, ABILITY_STORM_DRAIN, &wildMonIndex, LAND_WILD_COUNT))
+        if (OW_STORM_DRAIN == GEN_8 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_WATER, ABILITY_STORM_DRAIN, &wildMonIndex, LAND_WILD_COUNT))
             break;
 
         wildMonIndex = ChooseWildMonIndex_Land();
         break;
     case WILD_AREA_WATER:
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_STEEL, ABILITY_MAGNET_PULL, &wildMonIndex, WATER_WILD_COUNT))
+        if (OW_MAGNET_PULL < GEN_9 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_STEEL, ABILITY_MAGNET_PULL, &wildMonIndex, WATER_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_ELECTRIC, ABILITY_STATIC, &wildMonIndex, WATER_WILD_COUNT))
+        if (OW_STATIC < GEN_9 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_ELECTRIC, ABILITY_STATIC, &wildMonIndex, WATER_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_ELECTRIC, ABILITY_LIGHTNING_ROD, &wildMonIndex, WATER_WILD_COUNT))
+        if (OW_LIGHTNING_ROD == GEN_8 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_ELECTRIC, ABILITY_LIGHTNING_ROD, &wildMonIndex, WATER_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_FIRE, ABILITY_FLASH_FIRE, &wildMonIndex, WATER_WILD_COUNT))
+        if (OW_FLASH_FIRE == GEN_8 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_FIRE, ABILITY_FLASH_FIRE, &wildMonIndex, WATER_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_GRASS, ABILITY_HARVEST, &wildMonIndex, WATER_WILD_COUNT))
+        if (OW_HARVEST == GEN_8 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_GRASS, ABILITY_HARVEST, &wildMonIndex, WATER_WILD_COUNT))
             break;
-        if (TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_WATER, ABILITY_STORM_DRAIN, &wildMonIndex, WATER_WILD_COUNT))
+        if (OW_STORM_DRAIN == GEN_8 && TRY_GET_ABILITY_INFLUENCED_WILD_MON_INDEX(wildMonInfo->wildPokemon, TYPE_WATER, ABILITY_STORM_DRAIN, &wildMonIndex, WATER_WILD_COUNT))
             break;
 
         wildMonIndex = ChooseWildMonIndex_WaterRock();
@@ -587,7 +586,7 @@ static bool8 WildEncounterCheck(u32 encounterRate, bool8 ignoreAbility)
             encounterRate = encounterRate * 3 / 4;
         else if (ability == ABILITY_STENCH)
             encounterRate /= 2;
-        else if (ability == ABILITY_ILLUMINATE)
+        else if (ability == ABILITY_ILLUMINATE && OW_ILLUMINATE < GEN_9)
             encounterRate *= 2;
         else if (ability == ABILITY_WHITE_SMOKE)
             encounterRate /= 2;
@@ -599,10 +598,10 @@ static bool8 WildEncounterCheck(u32 encounterRate, bool8 ignoreAbility)
             encounterRate /= 2;
         else if (ability == ABILITY_QUICK_FEET)
             encounterRate /= 2;
-        else if (ability == ABILITY_INFILTRATOR)
+        else if (ability == ABILITY_INFILTRATOR && OW_INFILTRATOR == GEN_8)
             encounterRate /= 2;
         else if (ability == ABILITY_NO_GUARD)
-            encounterRate = encounterRate * 3 / 2;
+            encounterRate *= 2;
     }
     if (encounterRate > MAX_ENCOUNTER_RATE)
         encounterRate = MAX_ENCOUNTER_RATE;