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/ivysaur.asm

@@ -1,10 +1,10 @@
-; IvysaurPokedexEntry: ; 0x181702
 	db "SEED@" ; species name
 	dw 303, 290 ; height, weight
 
 	db   "The bulb on its"
 	next "back grows as it"
 	next "absorbs nutrients."
+
 	page "The bulb gives off"
 	next "a pleasant aroma"
 	next "when it blooms.@"