Game:

Pokémon Gold and Silver (1999)

Duration: 5:51

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Edit: I may fix the codes as I didn't mean to get TM16 x46 (46 of a non-buyable TM). I may be able to change it to TM46 x1 with another ld bc,(xxxx) and then adjust the codes from there.

These two Coin Case codes allow you to name your mother as well as yourself.

There is an unused name entry menu in Gold and Silver that lets the player name their mother, and the name is presumably supposed to be stored at D1AE, because the mother's name is written to here when you start a new game.

A control character (hex:49) displays the mother's name, but it is never used (Pokégear always calls her MOM). However, the location where the mother's name is stored is temporarily written to with the player's name to let the game remember it during the Dude's catching demonstration (as the player name is temporarily replaced with "DUDE").

In this video, I prepare a hacked mail 'written by the hex:49 control character'. I open the "Mother's Name" menu via a special Coin Case code (below) and set the location for the name data to be written to to D1AE, and since this is where the control character gets its data, I effectively change the author of the mail to the mother's name I write.

In the second part of the video, I show how you can bring up the Mother's Name screen with the GameShark code 0103D4C5; by bringing up a Pokémon's nickname screen. The Pokémon's nickname is still changed, though.


In the third part of the video, I use an altered version of my original code that changes the menu index number (via register b) from 03 (mother) to 01 (your name), as well as the location for the data to be written to D1A3 (where your name is stored). This lets you alter your name without hacking!

Initial requirements:
*A Quagsire holding a HP UP with Sleep Talk as its first move in party position 4.
*A freshly caught low level Pokémon in party position 3.
*A Coin Case

If the codes do not work try a different Quagsire and/or low level Pokémon. They may have bad DVs, that would interrupt the code flow to the second PC item's quantity etc.

Steps:
1) Have your PC item code and party Pokémon prepared.
2) Go to Elm's lab and save and reset.
3) Take four steps right (so you are below the tree), then open the Pokédex and listen to either Bellsprout or Machop's cry.
4) Exit the Pokédex, and open the items pack and switch over to the Key Items pocket. Switching pockets before viewing the Coin Case after listening to the cry in the current session is important, otherwise the trick may not work properly.

Code 1 - Change Mother's Name:
16 d1 01 (xx xx) 0c 1e ae 01 (xx xx) 26 5a 0d 3e 51 01 02 05 05 17 6f 48 79 05 0e 01 cf 2e f5 01 34 01 26 12 9e 33 c5 01 (xx xx) e9

Stored PC items from item 1:
(ANY ITEM)x(ANY)
(ANY ITEM)x22
TM18 x1
(ANY ITEM)x(ANY)
Awakening x30
Gold Berry x1
(ANY ITEM)x(ANY)
Full Heal x90
Paralyz Heal x62
Poison Barb x1
Ultra Ball x5
Poké Ball x23
Big Pearl x72
Energypowder x5
Full Restore x1
TM16 x46 - oops that's a bad requirement, I'll have to adjust the code.
HM03 x1
X Speed x1
Full Heal x18
Flower Mail x51
TM06 x1
ANYTHING x(ANY)
TM41 x1

ASM:
ld d,D1 : mum's name address byte 1
ld bc,(xxxx)
inc c
ld e,AE : mum's name address byte 2
ld bc,(xxxx)
ld h, 5A : h=5A for calling 5AXX (name entry script)
dec c
ld a,51 -: a=51, will be adjusted with rla
ld bc,0502 : b=05 (c=02)
dec b : b=04
rla : a=AD
ld l,a : l=AD : for calling 5AAD (name entry script)
ld c,b : c=04
ld a,c : a=04 : for making it bank 4
dec b : b=03 : index number for "Mother's Name?" menu.
ld c,01
rst 08 (call 04:5AAD)

Footer code to make the game not freeze after you enter a name - fixes the stack:

ld l,F5
ld bc,0134
ld h,12
sbc (hl)
inc sp
push bc
ld bc,xxxx
jp hl

Code 2: Change your name
16 D1 01 0A 01 0C 1E A3 01 0B 01 26 5A 0D 3E 51 01 02 05 05 17 6F 48 79 05 05 05 0E 01 CF 2E F5 01 34 01 26 12 9E 33 C5 01 31 31 E9

Stored PC items from item 1:
(ANY ITEM)x(ANY)
(ANY ITEM)x22
TM18 x1
(ANY ITEM)x(ANY)
Awakening x30
Light Ball x1
(ANY ITEM)x(ANY)
Full Heal x90
Paralyze Heal x62
Poison Barb x1
Ultra Ball x5
Poké Ball x23
Big Pearl x72
EnergyPowder x5
Poké Ball x5
Full Restore x1
TM16 x46
HM03 x1
X Speed x1
Full Heal x18
Flower Mail x51
TM06 x1
ANYTHING x(ANY)
TM41 x1

ASM:
ld d,D1 ; player's name address byte 1
ld bc,(xxxx)
inc c
ld e,A3; player's name address byte 2
ld bc,(xxxx)
ld h,5A : h=5A, for calling 5AXX (name entry script)
dec c
ld a,51 :a=51, will be adjusted with rla
ld bc,0502 :b=05 (c=02)
dec b :b=04
rla :a=AD
ld l,a : l=AD : for calling 5AAD (name entry script)
ld c,b : c=04
ld a,c : a=04 (bank 4)
dec b : b=03
dec b : b=02
dec b : b=01 (index number of player name entry)
ld c,01
rst 08 (call 04:5AAD)

Footer code to make the game not freeze after you enter a name - fixes the stack:

ld l,F5
ld bc,0134
ld h,12
sbc (hl)
inc sp
push bc
ld bc,xxxx
jp hl

Thanks TheZZAZZGlitch for his footer code, and Miksy91 for helping me find out how to activate the menu. :)

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