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/cloyster.asm

@@ -1,10 +1,10 @@
-; CloysterPokedexEntry: ; 0x1b8ad9
 	db "BIVALVE@" ; species name
 	dw 411, 2920 ; height, weight
 
 	db   "Even a missile"
 	next "can't break the"
 	next "spikes it uses to"
+
 	page "stab opponents."
 	next "They're even hard-"
 	next "er than its shell.@"