Add Trader to Celadon University

Includes fixes to allow trade evos to exist

data/events/trades.asm

@@ -12,4 +12,5 @@ TradeMons:
 	db KADABRA,    GRAVELER,  TRADE_DIALOGSET_POLITE, "SABURO@@@@@" ; From JP Blue
 	db VENONAT,    TANGELA,   TRADE_DIALOGSET_HAPPY,  "CRINKLES@@@"
 	db NIDORAN_M,  NIDORAN_F, TRADE_DIALOGSET_HAPPY,  "SPOT@@@@@@@"
+	db NO_MON,     NO_MON, 	  TRADE_DIALOGSET_SELF,   "Unseen@@@@@"
 	assert_table_length NUM_NPC_TRADES

data/maps/objects/CeladonUniversityInside.asm

@@ -8,6 +8,7 @@ CeladonUniversityInside_Object:
 	def_bg_events
 
 	def_object_events
-	object_event  8, 17, SPRITE_MIDDLE_AGED_MAN, STAY, ANY_DIR, 1 ; person
+	object_event  2,  3, SPRITE_MIDDLE_AGED_MAN, STAY, ANY_DIR, 1 ; person
+	object_event  4, 17, SPRITE_GAMEBOY_KID, STAY, DOWN, 2 ; person
 
 	def_warps_to CELADON_UNIVERSITY_INSIDE

data/text/text_7.asm

@@ -198,3 +198,21 @@ _UsedCutText::
 	text " hacked"
 	line "away with CUT!"
 	prompt
+
+_WannaTrade4Text::
+	text "I'm the TRADER!"
+	line "I love to help"
+	para "TRAINERs evolve"
+	line "their #MON!"
+	para "Wanna trade?"
+	done
+	
+_NoTrade4Text::
+	text "Ok, maybe next"
+	line "time then."
+	done
+	
+_Thanks4Text::
+	text "There we go!"
+	para "Hope I helped!"
+	done