Add trainers to Celadon University, add two new salesmen, etc

Overall completes Celadon University sans a problem with sprites being a bit corrupted until you leave. New Magikarp Salesman-esque events in other pokecenters which is kinda neat

text/RockTunnelPokecenter.asm

@@ -11,3 +11,42 @@ _RockTunnelPokecenterText3::
 	text "I sold a useless"
 	line "NUGGET for ¥5000!"
 	done
+
+_DittoSalesmanText1::
+	text "MAN: Hey there,"
+	line "kid! Nice to"
+	cont "see you again!"
+	
+	para "I have a very"
+	line "special deal"
+	cont "for you again!"
+	
+	para "For a limited"
+	line "time, you can"
+	cont "get access to"
+	cont "any #MON"
+	cont "in the world!"
+	
+	para "Every single"
+	line "#MON, for just"
+	cont "¥500! You can't"
+	cont "refuse that!"
+	
+	done
+
+_DittoSalesmanNoText::
+	text "No? Time's"
+	line "ticking!"
+	done
+
+_DittoSalesmanNoMoneyText::
+	text "You'll need more"
+	line "money than that!"
+	done
+
+_DittoSalesmanText2::
+	text "MAN: Sold as seen!"
+	line "You can't get"
+	cont "every #MON"
+	cont "at the same time!"
+	done