Turn some magic numbers into named constants

src/battle_script_commands.c

@@ -4555,7 +4555,7 @@ static void Cmd_moveend(void)
         case MOVEEND_CHOICE_MOVE: // update choice band move
             if (gHitMarker & HITMARKER_OBEYS
              && holdEffectAtk == HOLD_EFFECT_CHOICE_BAND
-             && gChosenMove != MOVE_STRUGGLE 
+             && gChosenMove != MOVE_STRUGGLE
              && (*choicedMoveAtk == 0 || *choicedMoveAtk == 0xFFFF))
             {
                 if (gChosenMove == MOVE_BATON_PASS && !(gMoveResultFlags & MOVE_RESULT_FAILED))
@@ -7826,7 +7826,7 @@ static void Cmd_weatherdamage(void)
                 gBattleMoveDamage = 0;
             }
         }
-        if (gBattleWeather & WEATHER_HAIL)
+        if (gBattleWeather & WEATHER_HAIL_ANY)
         {
             if (!IS_BATTLER_OF_TYPE(gBattlerAttacker, TYPE_ICE)
                 && !(gStatuses3[gBattlerAttacker] & STATUS3_UNDERGROUND)

src/field_control_avatar.c

@@ -30,6 +30,7 @@
 #include "wild_encounter.h"
 #include "constants/bg_event_constants.h"
 #include "constants/event_objects.h"
+#include "constants/field_poison.h"
 #include "constants/map_types.h"
 #include "constants/maps.h"
 #include "constants/songs.h"
@@ -647,11 +648,11 @@ static bool8 UpdatePoisonStepCounter(void)
         {
             switch (DoPoisonFieldEffect())
             {
-            case 0:
+            case FLDPSN_NONE:
                 return FALSE;
-            case 1:
+            case FLDPSN_PSN:
                 return FALSE;
-            case 2:
+            case FLDPSN_FNT:
                 return TRUE;
             }
         }

src/pokemon.c

@@ -3271,7 +3271,7 @@ s32 CalculateBaseDamage(struct BattlePokemon *attacker, struct BattlePokemon *de
             }
 
             // any weather except sun weakens solar beam
-            if ((gBattleWeather & (WEATHER_RAIN_ANY | WEATHER_SANDSTORM_ANY | WEATHER_HAIL)) && gCurrentMove == MOVE_SOLAR_BEAM)
+            if ((gBattleWeather & (WEATHER_RAIN_ANY | WEATHER_SANDSTORM_ANY | WEATHER_HAIL_ANY)) && gCurrentMove == MOVE_SOLAR_BEAM)
                 damage /= 2;
 
             // sunny