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/forretress.asm

@@ -1,10 +1,10 @@
-; ForretressPokedexEntry: ; 0x1d0524
 	db "BAGWORM@" ; species name
 	dw 311, 2770 ; height, weight
 
 	db   "Usually found"
 	next "hanging on to a"
 	next "fat tree trunk. It"
+
 	page "shoots out bits of"
 	next "its shell when it"
 	next "sees action.@"