Use a predef macro that takes labels instead of juggling constants.

Besides making predefs convenient, naming a predef no longer requires
adding or renaming a predef constant. This also lets predefs be rearranged at will.

home/init.asm

@@ -167,8 +167,7 @@ Init:: ; 17d
 
 	call DelayFrame
 
-	ld a, $30
-	call Predef
+	predef Function9853
 
 	call SoundRestart
 	xor a

home/pokedex_flags.asm

@@ -31,8 +31,7 @@ CheckSeenMon:: ; 339b
 
 PokedexFlagAction:: ; 33a1
 	ld d, 0
-	ld a, PREDEF_FLAG
-	call Predef
+	predef FlagPredef
 	ld a, c
 	and a
 	ret