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/pikachu.asm

@@ -1,10 +1,10 @@
-; PikachuPokedexEntry: ; 0x1820ad
 	db "MOUSE@" ; species name
 	dw 104, 130 ; height, weight
 
 	db   "When it is anger-"
 	next "ed, it immediately"
 	next "discharges the"
+
 	page "energy stored in"
 	next "the pouches in its"
 	next "cheeks.@"