Clean up comments

Base data: types uniquely lacked a comment; items on one line; distinguish unknowns
Dex entries: don't imply that pointers don't exist

data/pokemon/dex_entries/celebi.asm

@@ -1,10 +1,10 @@
-; CelebiPokedexEntry: ; 0x1d18cc
 	db "TIMETRAVEL@" ; species name
 	dw 200, 110 ; height, weight
 
 	db   "Revered as a"
 	next "guardian of the"
 	next "forest, CELEBI"
+
 	page "appears wherever"
 	next "beautiful forests"
 	next "exist.@"