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Mobile Trainer

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Title Screen

Mobile Trainer

Also known as: Mobile Starter Cartridge (original name)
Developers: Mobile21, MissingLink
Publisher: Nintendo
Platform: Game Boy Color
Released in JP: January 27, 2001

DevMessageIcon.png This game has a hidden developer message.
DevTextIcon.png This game has hidden development-related text.
DebugIcon.png This game has debugging material.
SoundtestIcon.png This game has a hidden sound test.

NotesIcon.png This game has a notes page

See, this is why game preservation is important.
This game is defunct.
Do note the game no longer works at all without modifications. This is most likely due to the game's servers being shut down. As a result, further official developments with the game are unlikely to happen.
To do:
It may be worth adding the hidden Pokémon graphics as they could be unused.

The Mobile Trainer was used along with a peripheral that allowed Game Boy Colors to connect to cell phones, allowing players to communicate with each other wirelessly.

However, much of its target audience was unable to use it (without parental permission), multiple cables were required for different phones, and not many games used it extensively. As a result, it was shut down in December 2002.


Miscellaneous tidbits that are interesting enough to point out here.

Debug Mode

Mobile Trainer (GBC) debug.png

Game Genie code 190-05B-7FF will start the game in Debug Mode (no mobile link device needed).

Here you may toggle on or off some internal debug flags. There are 8-bit value and 8 debug flags to toggle. You may choose which flags to toggle either in decimal or binary representations. Pressing Start will toggle between decimal and binary modes.

In both modes, press Left / Right to select the digit to edit. Press A to change this digit.

In the decimal edit mode there are 5 digits, but only 3 of them are editable. If you select two other digits, the A button will reset the number to zero.

Press Select or B to exit this menu and return to the normal game.

(Source: Háčky, CaH4e3 (activation))

Sound Test

Mobile Trainer (GBC) soundtest.png

Game Genie codes 1B0-05B-7FF 400-03B-E6A will start the game in Sound Test mode (no mobile link device needed).

Below is a list of music indices and where they are used:

  • 00: No sound
  • 01: Title screen
  • 02: Main menu
  • 03: Email menu
  • 04: Email subject
  • 05: Input email text
  • 06: Address book
  • 07: Sending an email (creation)
  • 08: Mobile settings
  • 09: Setting sub-menus
  • 0A: Connecting to DION (seems to be a rearrangement of Hello Kitty Pocket Camera's title screen music)
  • 0B: Connecting to server
  • 0C: Sending an email (operation)
  • 0D: Connection terminated
  • 0E: Sent and received mail menu
  • 0F: ???
  • 10: Choose how to delete an email
  • 11: Homepage menu
  • 12: Connection prompt
  • 13: Completed connection
  • 14: ???
  • 15: Communication error
  • 16: Help menu
  • 17: Feature explanation
  • 18: No sound (unused?)
  • 19: Welcome message (rearrangement of the "copy" screen music in Hello Kitty Pocket Camera)
  • 1A: Mobile dictionary
  • 1B: No sound (unused?)
  • 1C: ??? (similar or identical to 0F)
  • 1D: Time prompt
  • 1E-28: Title screen copy (unused?)
  • 29-46: Sound effects
(Source: Torchickens)

Error Test

Mobile Trainer (GBC)-errortest.png

Game Genie codes 800-03B-E6A 490-04B-E6B 190-05B-7FF will start the game in Error Messages Test mode. The controls are the same as in the Sound Test.

Test Messages

Starting at 0xB42BB in the ROM are a few test messages. Notably, this includes mesages from Mario and Bowser plus one touting the nonexistent game "Pokémon Moss".

Original Message Translation
Play again this time.
Let's Play Again.
On the first Sunday of July,
I'll come out from playing baseball.
King Bowser
I'm playing baseball.
GAMER's Life
At last, the newest Pokémon entry will be introduced!
For more on "Pokémon Moss", go to Nintendo's home page!
e-Mail Magazine GB
GAMER's Life
Because of maintenance on the mail center,
please take note that you will not be able to check your mail
for a period, starting from July 14 and going until July 20.
GB Center
Important Notice
(Source: Háčky (text), counterDiving (translations))