Rename all files in data/pokedex/entries/

Some people suggested this would be a good idea, and make management of
the files easier. I'm inclined to agree.

data/pokedex/entries/hypno.asm

@@ -0,0 +1,10 @@
+; HypnoPokedexEntry: ; 0x1b8d80
+	db "HYPNOSIS@" ; species name
+	dw 503, 1670 ; height, weight
+
+	db   "The longer it"
+	next "swings its"
+	next "pendulum, the"
+	page "longer the effects"
+	next "of its hypnosis"
+	next "last.@"