Use fadescreen constants

data/event_scripts.s

@@ -24,6 +24,7 @@
 #include "constants/field_poison.h"
 #include "constants/field_specials.h"
 #include "constants/field_tasks.h"
+#include "constants/field_weather.h"
 #include "constants/flags.h"
 #include "constants/frontier_util.h"
 #include "constants/game_stat.h"
@@ -720,9 +721,9 @@ Common_EventScript_ShowPokemonCenterSign:: @ 8271E73
 	end
 
 Common_ShowEasyChatScreen:: @ 8271E7C
-	fadescreen 1
+	fadescreen FADE_TO_BLACK
 	special ShowEasyChatScreen
-	fadescreen 0
+	fadescreen FADE_FROM_BLACK
 	return
 
 Common_EventScript_ReadyPetalburgGymForBattle:: @ 8271E84
@@ -773,17 +774,17 @@ Common_EventScript_PlayGymBadgeFanfare:: @ 827207E
 	return
 
 Common_EventScript_OutOfCenterPartyHeal:: @ 8272083
-	fadescreen 1
+	fadescreen FADE_TO_BLACK
 	playfanfare MUS_ME_ASA
 	waitfanfare
 	special HealPlayerParty
-	fadescreen 0
+	fadescreen FADE_FROM_BLACK
 	return
 
 EventScript_RegionMap:: @ 827208F
 	lockall
 	msgbox Common_Text_LookCloserAtMap, MSGBOX_DEFAULT
-	fadescreen 1
+	fadescreen FADE_TO_BLACK
 	special FieldShowRegionMap
 	waitstate
 	releaseall
@@ -868,7 +869,7 @@ Common_EventScript_FerryDepartIsland:: @ 8272250
 	.include "data/scripts/kecleon.inc"
 
 Common_EventScript_NameReceivedPartyMon:: @ 82723DD
-	fadescreen 1
+	fadescreen FADE_TO_BLACK
 	special ChangePokemonNickname
 	waitstate
 	return
@@ -1045,16 +1046,16 @@ Common_EventScript_DirectCornerAttendant:: @ 8273767
 	end
 
 Common_EventScript_RemoveStaticPokemon:: @ 827376D
-	fadescreenswapbuffers 1
+	fadescreenswapbuffers FADE_TO_BLACK
 	removeobject VAR_LAST_TALKED
-	fadescreenswapbuffers 0
+	fadescreenswapbuffers FADE_FROM_BLACK
 	release
 	end
 
 Common_EventScript_LegendaryFlewAway:: @ 8273776
-	fadescreenswapbuffers 1
+	fadescreenswapbuffers FADE_TO_BLACK
 	removeobject VAR_LAST_TALKED
-	fadescreenswapbuffers 0
+	fadescreenswapbuffers FADE_FROM_BLACK
 	bufferspeciesname 0, VAR_0x8004
 	msgbox gText_LegendaryFlewAway, MSGBOX_DEFAULT
 	release