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Mailbox glitches
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Major glitches of the Pokémon series

Arbitrary code execution (template, remote, cart-swap, unintended ROM code execution) | 2x2 block encounter glitches (Left-facing shore tile glitch (in-game trade shore encounter trick, old man trick, Trade link up shore encounter trick, Fight Safari Zone Pokémon trick)) | 99 item stack glitch | Bad clone glitch (????? party overloading (Type 0xD0 move glitch, ????? map corruption, | Celebi trick, Celebi Egg trick, Shiny Celebi trick, glitch move map corruption, overloaded party map corruption, Glitch Unown (Glitch Unown map corruption) Duplicate key items glitch (infinite items and item creation, expanded Balls pocket (TM/HMs outside of the TM/HM pocket, Glitch Pokédex categories)) | Berry glitch | Bug-Catching Contest data copy glitch (Japan only) | Cloning | Ditto DV manipulation | Elite Four door glitch (Japan only) | Expanded party encounter table manipulation | Glitch City (Safari Zone exit glitch, RAM manipulation) | Glitch meta-map script activation (Generation I) | Infinite Master Balls (Colosseum) | Large storage box byte shift glitch (storage box remaining HP glitch, maximum stat glitch) | Item duplication glitch | Item stack duplication glitch (Generation I expanded items pack (Glitch Rocket HQ maps, Map FE (English and non-English European Yellow), Map script pointer manipulation (arbitrary code execution, map script pointer item ball manipulation), Text pointer manipulation (arbitrary code execution, item ball manipulation, mart buffer overflow), Trainerless instant encounter glitch) | Transform held item glitch (Japan only) | Mimic glitch (Japan only) | Out of bounds Glitch City (Generation II) (Slowpoke Well out of bounds corruption (French version)) Lumiose City save glitch | Pikachu off-screen glitch (Trainer corruption glitch) | Pokémon merge glitch | Pomeg glitch (Pomeg data corruption glitch) | Roaming Pokémon encounter glitch | (Mimic) Transform Rage glitch | Select glitches (Japan only) (Closed menu: Dokokashira door glitch (international), Fossil conversion glitch (international), Second type glitch, Skip to Level 100 glitch, Trainer mutation glitch, walk through walls (international) Special menu: Lift glitch, Badge describer glitch) | Sketch glitch | SRAM glitch (Generation I) (255 Pokémon glitch, send party Pokémon to a new game) | Surf down glitch (Grass/rock Surfing glitch (Spanish/Italian only) (English)) | Time Capsule exploit | SRAM glitches (Generation II) (Mailbox glitches, Mystery Gift item corruption, Trainer House glitches) | Tweaking | Trainer escape glitch (Death-warp, Mew Trick, Ditto Trick, Experience underflow glitch) | Buffer overflow techniques (Japanese unterminated name glitch item instant encounter glitch, LOL glitch, Rival LOL glitch, Instant LOL glitch, RAM LOL glitch, oobLG, blockoobLG, Instant encounter infinite chain glitch (LGFly)), Super Glitch (Generation I) (party remaining HP glitch), Super Glitch (Generation III), Text pointer manipulation mart buffer overflow glitch, CoolTrainer♀-type move, Double distort CoolTrainer♀ corruption, Yami Shop glitch) | Walk through walls (ledge method, museum guy method, Rival's effect, Select glitch method (international), Brock Through Walls) | ZZAZZ glitch (party Pokémon box data shift glitch)

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Mailbox glitches are a division of SRAM glitches in Generation II.

These glitches occur in Pokémon Gold and Silver (and Pokémon Crystal with arbitrary code execution) when data for the player's mailbox becomes corrupted with glitch mail. When the player has an excessive number of mail, viewing the mailbox may cause a Glitch City.

The glitches are often accompanied by Trainer House glitches, a delivery man appearing in Pokémon Centers and/or the Mystery Gift option becoming available on the menu without having to talk to the girl in green on Goldenrod City Department Store's fifth floor.

The glitch can be activated by viewing certain glitch Unown in the Pokédex, which are available through ????? party overloading or arbitrary code execution (e.g. via the Coin Case glitch).

Glitch mail

A glitched Mail Box caused by a Glitch Unown.

Glitch mail refers to glitchy mail sometimes generated inside the player's mail box in Generation II after corruption.

Glitch mail may be of an invalid type (meaning that it has an index number which is not used for a valid mail item such as Flower Mail), and may display glitch text, either in the contents or message itself, or both. Glitch mail may be signed from 'GREEN', which is from the control character hex:39, and will appear in "00 39" corruption patterns.

A glitch mail will become an item when it is put into the bag, depending on the mail item's index number. As mentioned above, a mail item in the mailbox may not be of a valid kind (this is the case with most index numbers), so it is possible to obtain items such as "?" (hex:00), which will not bring up a screen to attach a message to it when the item is held by a Pokémon.

Excessive mail glitch

When there is an excessive amount of mail (the maximum is meant to be 10), glitches will occur when the mail box is opened.

Effects in Pokémon Gold and Silver include:

  • Corruption of the overworld.
  • A changed walking animation.
  • Corruption of the start menu options.
  • A corrupted wild Pokémon, and a forced 'link battle'.

Obtaining glitch mail

More research is needed for this article.
Gen III 00FC-0114.png
Reason given: Check validity of other methods.

This effect is not too uncommon and can occur after cheating, but there is a way to get it without cheating.

Glitch mail in the player's box, and others effects such as a glitch Trainer House Trainer can be obtained with the Unown SRAM corruption glitch, which can be pulled off by viewing a certain glitch Unown in Unown Mode of the Pokédex.

Glitch Unown can be obtained with the ????? party overloading, and a working value that creates glitch mail is the hex:24 (5th Pokémon's Defense is 36 modulo 256) type.

Invalid glitch mail types

Many and possibly all but one invalid glitch mail types look like the Flower Mail but with the wrong colors. The color changes are different between Pokémon Gold/Silver and Pokémon Crystal.

Type Background color Five-petal flower and border color Four-petal flower and name field color Oddish color
Flower Mail Light green Orange Red Red
General glitch mail type (Gold/Silver) Purple Green White Black
General glitch mail type (Crystal) Light blue Blue Pink Red

In Pokémon Gold and Silver, the hex:FF invalid glitch mail type simply loads a purple screen, but the game does not freeze and the player can return to the mail box.

GS Mail FF.png

In Pokémon Crystal, the hex:FF invalid glitch mail type causes a completely different effect. It forces an unexpected reset (but not a Glitch Dimension) and many values are corrupted from CFBB-E0A4 (corruption of values to hex:07 has only been reported as of yet). Many of these values are unchanged when the player selects 'continue' and bad effects on the game are noticeable from there, but no apparent corruption effects are noticeable when the player selects 'new game'

YouTube video by ChickasaurusGL

See this thread for more information.