Use more constants in scripts

maps/ElmsLab.asm

@@ -161,7 +161,7 @@ CyndaquilPokeBallScript:
 	checkevent EVENT_GOT_A_POKEMON_FROM_ELM
 	iftrue LookAtElmPokeBallScript
 	spriteface ELMSLAB_ELM, DOWN
-	refreshscreen $0
+	refreshscreen
 	pokepic CYNDAQUIL
 	cry CYNDAQUIL
 	waitbutton
@@ -175,7 +175,7 @@ CyndaquilPokeBallScript:
 	writetext ChoseStarterText
 	buttonsound
 	waitsfx
-	pokenamemem CYNDAQUIL, $0
+	pokenamemem CYNDAQUIL, MEM_BUFFER_0
 	writetext ReceivedStarterText
 	playsound SFX_CAUGHT_MON
 	waitsfx
@@ -191,7 +191,7 @@ TotodilePokeBallScript:
 	checkevent EVENT_GOT_A_POKEMON_FROM_ELM
 	iftrue LookAtElmPokeBallScript
 	spriteface ELMSLAB_ELM, DOWN
-	refreshscreen $0
+	refreshscreen
 	pokepic TOTODILE
 	cry TOTODILE
 	waitbutton
@@ -205,7 +205,7 @@ TotodilePokeBallScript:
 	writetext ChoseStarterText
 	buttonsound
 	waitsfx
-	pokenamemem TOTODILE, $0
+	pokenamemem TOTODILE, MEM_BUFFER_0
 	writetext ReceivedStarterText
 	playsound SFX_CAUGHT_MON
 	waitsfx
@@ -219,7 +219,7 @@ ChikoritaPokeBallScript:
 	checkevent EVENT_GOT_A_POKEMON_FROM_ELM
 	iftrue LookAtElmPokeBallScript
 	spriteface ELMSLAB_ELM, DOWN
-	refreshscreen $0
+	refreshscreen
 	pokepic CHIKORITA
 	cry CHIKORITA
 	waitbutton
@@ -233,7 +233,7 @@ ChikoritaPokeBallScript:
 	writetext ChoseStarterText
 	buttonsound
 	waitsfx
-	pokenamemem CHIKORITA, $0
+	pokenamemem CHIKORITA, MEM_BUFFER_0
 	writetext ReceivedStarterText
 	playsound SFX_CAUGHT_MON
 	waitsfx
@@ -311,7 +311,7 @@ ElmsLabHealingMachine_HealParty:
 	special TrainerRankings_Healings
 	special HealParty
 	playmusic MUSIC_NONE
-	writebyte 1 ; Machine is in Elm's Lab
+	writebyte HEALMACHINE_ELMS_LAB
 	special HealMachineAnim
 	pause 30
 	special RestartMapMusic
@@ -500,7 +500,7 @@ AideScript_GiveYouBalls:
 	opentext
 	writetext AideText_GiveYouBalls
 	buttonsound
-	itemtotext POKE_BALL, $1
+	itemtotext POKE_BALL, MEM_BUFFER_1
 	scall AideScript_ReceiveTheBalls
 	giveitem POKE_BALL, 5
 	writetext AideText_ExplainBalls