added seasons and season based form encounters

include/rtc.h

@@ -88,6 +88,13 @@
 #define TIME_EVENING           2
 #define TIME_NIGHT             3
 
+#define SEASON_SPRING   0
+#define SEASON_SUMMER   1
+#define SEASON_AUTUMN   2
+#define SEASON_WINTER   3
+#define NUM_SEASONS     4
+#define DAYS_PER_SEASON 5
+
 extern struct Time gLocalTime;
 
 void RtcDisableInterrupts(void);
@@ -118,5 +125,6 @@ void RtcCalcLocalTimeOffset(s32 days, s32 hours, s32 minutes, s32 seconds);
 void CalcTimeDifference(struct Time *result, struct Time *t1, struct Time *t2);
 u32 RtcGetMinuteCount(void);
 u32 RtcGetLocalDayCount(void);
+u8 GetSeason(void);
 
 #endif // GUARD_RTC_UTIL_H

src/data/wild_encounters.json

@@ -8263,27 +8263,27 @@
               {
                 "min_level": 3,
                 "max_level": 3,
-                "species": "SPECIES_FARFETCHD_GALARIAN"
+                "species": "SPECIES_DEERLING"
               },
               {
                 "min_level": 3,
                 "max_level": 3,
-                "species": "SPECIES_FARFETCHD_GALARIAN"
+                "species": "SPECIES_DEERLING"
               },
               {
                 "min_level": 3,
                 "max_level": 3,
-                "species": "SPECIES_FARFETCHD_GALARIAN"
+                "species": "SPECIES_DEERLING"
               },
               {
                 "min_level": 3,
                 "max_level": 3,
-                "species": "SPECIES_FARFETCHD_GALARIAN"
+                "species": "SPECIES_DEERLING"
               },
               {
                 "min_level": 2,
                 "max_level": 2,
-                "species": "SPECIES_FARFETCHD_GALARIAN"
+                "species": "SPECIES_DEERLING"
               },
               {
                 "min_level": 2,

src/rtc.c

@@ -307,6 +307,25 @@ u8 GetTimeOfDay(void)
     return TIME_DAY;
 }
 
+u8 GetSeason(void)
+{
+    u8 seasonIndex;
+
+    RtcCalcLocalTime();
+    seasonIndex = (gLocalTime.days / DAYS_PER_SEASON) % NUM_SEASONS;
+    switch (seasonIndex)
+    {
+        case 0:
+            return SEASON_SPRING;
+        case 1:
+            return SEASON_SUMMER;
+        case 2:
+            return SEASON_AUTUMN;
+        case 3:
+            return SEASON_WINTER;
+    }
+}
+
 void RtcCalcLocalTime(void)
 {
     RtcGetInfo(&sRtc);

src/wild_encounter.c

@@ -14,6 +14,7 @@
 #include "link.h"
 #include "quest_log.h"
 #include "safari_zone.h"
+#include "rtc.h"
 #include "constants/maps.h"
 #include "constants/abilities.h"
 #include "constants/items.h"
@@ -226,11 +227,56 @@ static bool8 UnlockedTanobyOrAreNotInTanoby(void)
     return FALSE;
 }
 
+static u16 GetSeasonalDeerling()
+{
+    switch (GetSeason())
+    {
+    case SEASON_SPRING:
+        return SPECIES_DEERLING_SPRING;
+    case SEASON_SUMMER:
+        return SPECIES_DEERLING_SUMMER;
+    case SEASON_AUTUMN:
+        return SPECIES_DEERLING_AUTUMN;
+    case SEASON_WINTER:
+        return SPECIES_DEERLING_WINTER;
+    }
+    return SPECIES_DEERLING;
+}
+
+static u16 GetSeasonalSawsbuck()
+{
+    switch (GetSeason())
+    {
+    case SEASON_SPRING:
+        return SPECIES_SAWSBUCK_SPRING;
+    case SEASON_SUMMER:
+        return SPECIES_SAWSBUCK_SUMMER;
+    case SEASON_AUTUMN:
+        return SPECIES_SAWSBUCK_AUTUMN;
+    case SEASON_WINTER:
+        return SPECIES_SAWSBUCK_WINTER;
+    }
+    return SPECIES_SAWSBUCK;
+}
+
+static u16 GetSeasonalSpecies(u16 species)
+{
+    switch(species)
+    {
+        case SPECIES_DEERLING:
+            return GetSeasonalDeerling();
+        case SPECIES_SAWSBUCK:
+            return GetSeasonalSawsbuck();
+    }
+    return species;
+}
+
 static void GenerateWildMon(u16 species, u8 level, u8 slot)
 {
     u32 personality;
     s8 chamber;
     ZeroEnemyPartyMons();
+    species = GetSeasonalSpecies(species);
     if (species != SPECIES_UNOWN)
     {
         CreateMonWithNature(&gEnemyParty[0], species, level, USE_RANDOM_IVS, Random() % NUM_NATURES);