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/pichu.asm

@@ -1,10 +1,10 @@
-; PichuPokedexEntry: ; 0x1cd243
 	db "TINY MOUSE@" ; species name
 	dw 100, 40 ; height, weight
 
 	db   "It is unskilled at"
 	next "storing electric"
 	next "power. Any kind of"
+
 	page "shock causes it to"
 	next "discharge energy"
 	next "spontaneously.@"