Created Define the Old Pokédex Order (markdown)

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+[PLEASE EDIT] This tutorial is to be able to give the Old Pokédex order a different order other than by using the index order of the Pokémon themselves.
+
+
+## Contents
+
+1. [Define Old Pokédex Order](#1-define-old-pokédex-order)
+2. [Edit how the old order gets found](#2-edit-how-the-old-order-gets-found)
+3. [Include in the ROM](#3-include-in-the-rom)
+
+## 1. Define Old Pokédex Order
+
+Create **data/pokemon/dex_order_old.asm**. Pretty much the same as [constants/pokemon_constants.asm](../blob/master/constants/pokemon_constants.asm).
+
+```diff
++OldPokedexOrder:
++	db BULBASAUR
++	db IVYSAUR
++	db VENUSAUR
+...
++	db LUGIA
++	db HO_OH
++	db CELEBI
+```
+
+## 2. Edit how the old order gets found
+
+Edit [engine/pokedex/pokedex.asm](../blob/master/engine/pokedex/pokedex.asm)
+
+```diff
+Pokedex_OrderMonsByMode:
+...
+ .NewMode:
+	 ld de, NewPokedexOrder
++.do_dex
+	ld hl, wPokedexOrder
+	ld c, NUM_POKEMON
+ .loopnew
+	ld a, [de]
+	inc de
+	ld [hli], a
+	dec c
+	jr nz, .loopnew
+	call .FindLastSeen
+	ret
+
+ .OldMode:
+-	ld hl, wPokedexOrder
+-	ld a, $1
+-	ld c, NUM_POKEMON
+-.loopold
+-	ld [hli], a
+-	inc a
+-	dec c
+-	jr nz, .loopold
+-	call .FindLastSeen
+-	ret
++	ld de, OldPokedexOrder
++	jr .do_dex
+```
+
+## Include in ROM
+
+Edit [engine/pokedex/pokedex.asm](../blob/master/engine/pokedex/pokedex.asm)
+
+```diff
+ INCLUDE "data/pokemon/dex_order_alpha.asm"
+
+ INCLUDE "data/pokemon/dex_order_new.asm"
++
++INCLUDE "data/pokemon/dex_order_old.asm"
+
+ Pokedex_DisplayModeDescription:
+```
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