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/smeargle.asm

@@ -0,0 +1,10 @@
+; SmearglePokedexEntry: ; 0x1d11e0
+	db "PAINTER@" ; species name
+	dw 311, 1280 ; height, weight
+
+	db   "The color of the"
+	next "mysterious fluid"
+	next "secreted from its"
+	page "tail is predeter-"
+	next "mined for each"
+	next "SMEARGLE.@"