How To Change Wild Pokemon Encounters

This tutorial will go over how to change the Pokemon you encounter along your journey.

Contents

• Understanding How Encounters Work
• Picking A Map To Change
• Editing That File

Understanding How Encounters Work

Wild Pokemon encounters are coded in a set percentage, and there are ten Pokemon slots available to be changed.

db $32, $00 ; First Slot 20% Chance
db $65, $02 ; Second Slot 20% Chance
db $8C, $04 ; Third Slot 15% Chance
db $A5, $06 ; Fourth Slot 10% Chance
db $BE, $08 ; Fifth Slot 10% Chance
db $D7, $0A ; Sixth Slot 10% Chance
db $E4, $0C ; Seventh Slot 5% Chance
db $F1, $0E ; Eighth Slot 5% Chance
db $FC, $10 ; Ninth Slot 4% Chance
db $FF, $12 ; Tenth Slot 1% Chance

Picking A Map To Change

All places where Pokemon spawn located in data/wild/maps

Editing That File

Order: Level, Pokemon

If you want only route 1 to have legendary Pokemon in the mix of existing ones, you would do this:

Route1Mons:
	db $19
	db 3,PIDGEY
	db 4,PIDGEY
	db 2,RATTATA
	db 3,RATTATA
	db 2,PIDGEY
-	db 3,PIDGEY
+	db 6,ARTICUNO
-	db 5,PIDGEY
+	db 6,ZAPDOS
-	db 4,RATTATA
+	db 6,MOLTRES
-	db 6,PIDGEY
+	db 6,MEWTWO
-	db 7,PIDGEY
+	db 6,MEW
	db $00

Done!