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/mewtwo.asm

@@ -1,10 +1,10 @@
-; MewtwoPokedexEntry: ; 0x1cc8ae
 	db "GENETIC@" ; species name
 	dw 607, 2690 ; height, weight
 
 	db   "Said to rest qui-"
 	next "etly in an"
 	next "undiscovered cave,"
+
 	page "this #MON was"
 	next "created solely for"
 	next "battling.@"