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+This tutorial is for how to add new types for Pokemon or moves. As an example, we'll be adding the Dark type first introduced in Generation II.
+
+## Contents
+
+## 1. Define a type constant
+
+Gen I was before the Physical/Special split, so any types with an index number less than $14 are physical, and anything afterwards or equalivent to is special. Dark type was classified as a physical type in Gen II and III, so we'll include Dark type as Type $09.
+
+Edit [constants/type_constants.asm](../blob/master/constants/type_constants.asm):
+
+```diff
+ ; Elemental types
+ NORMAL   EQU $00
+ FIGHTING EQU $01
+ FLYING   EQU $02
+ POISON   EQU $03
+ GROUND   EQU $04
+ ROCK     EQU $05
+ BUG      EQU $07
+ GHOST    EQU $08
++DARK     EQU $09
+ FIRE     EQU $14
+ WATER    EQU $15
+ GRASS    EQU $16
+ ELECTRIC EQU $17
+ PSYCHIC  EQU $18
+ ICE      EQU $19
+ DRAGON   EQU $1A
+  TYPES_END EQU const_value
+```
+
+## 2. Give the type a name.
+
+Edit [text/type_names.asm](../blob/master/text/type_names.asm):
+
+```diff
+TypeNames:
+
+	 dw .Normal
+	 dw .Fighting
+	 dw .Flying
+	 dw .Poison
+	 dw .Ground
+	 dw .Rock
+	 dw .Bird
+	 dw .Bug
+	 dw .Ghost
+
++        dw .Dark
+-	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+	 dw .Normal
+
+	 dw .Fire
+	 dw .Water
+	 dw .Grass
+	 dw .Electric
+	 dw .Psychic
+ 	 dw .Ice
+ 	 dw .Dragon
+
+ .Normal:   db "NORMAL@"
+ .Fighting: db "FIGHTING@"
+ .Flying:   db "FLYING@"
+ .Poison:   db "POISON@"
+ .Fire:     db "FIRE@"
+ .Water:    db "WATER@"
+ .Grass:    db "GRASS@"
+ .Electric: db "ELECTRIC@"
+ .Psychic:  db "PSYCHIC@"
+ .Ice:      db "ICE@"
+ .Ground:   db "GROUND@"
+ .Rock:     db "ROCK@"
+ .Bird:     db "BIRD@"
+ .Bug:      db "BUG@"
+ .Ghost:    db "GHOST@"
+ .Dragon:   db "DRAGON@"
++.Dark:     db "DARK@"
+```
+
+## 3. List the type matchups.
+
+Edit [data/type_effects.asm](../blob/master/data/type_effects.asm):
+
+```diff
+
+ TypeEffects:
+ ; format: attacking type, defending type, damage multiplier
+ ; the multiplier is a (decimal) fixed-point number:
+ ;     20 is ×2.0
+ ;     05 is ×0.5
+ ;     00 is ×0
+         db WATER,FIRE,20
+	 db FIRE,GRASS,20
+         ...
+        db ICE,DRAGON,20
+	db DRAGON,DRAGON,20
++       db DARK,GHOST,20
++       db DARK,PSYCHIC,20
++       db DARK,DARK,05
++       db DARK,FIGHTING,05
++       db GHOST,DARK,05
++       db BUG,DARK,20
++       db FIGHTING,DARK,20
++       db PSYCHIC,DARK,00
+        db $ff
+
+WIP