Game:

Pokémon Ruby and Sapphire (2002)

Duration: 8:17

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In the Japanese version of Pokémon Ruby and Sapphire, it's possible to swap a mail item for another item using Trick. It is impossible for Trick to work with mail in the English versions, so the glitches caused by swapping mail don't occur there.

You can do this with a Kadabra (that learns Trick at level 43) and the Numel on Route 112, because they always have a held item (Rawst Berry). This gives you a Rawst Berry (and presumably Numel a mail item), but the first glitch happens after Trick, providing you don't get burned and lose the Berry:

Even though the held item has an item option and is managed like a Rawst Berry, it still has the mail icon. Taking it gives you a Rawst Berry.

Second glitch: For reasons that I don't know, repeating this glitch six times lets you get more Rawst Berries without using Trick on a Numel, and you no longer have to give the mail a message! (the amount you can get in the end is greater than the number of Numel you fought)

A way you can do this:

1) Attach mail to Kadabra.
2) Trick it with Numel.
3) Give Kadabra mail again.
4) Repeat steps 2) and 3) six times, and on the sixth time you won't have to put a message in the mail.
5) You can swap the item with mail to get Rawst Berries out of nowhere.

Third glitch (weird mail fields):

After doing the second glitch, Fly to Mosdeep City and go to the first rock thing from the shore so it's directly above you. Take off Kadabra's mail then give another Pokémon mail. It doesn't matter if you are on or off a Bicycle. There may be '???'s or other sayings already in the message slots. This normally doesn't happen without glitches, because the fields should be stored with five underscores by default. Enter something in the middle field and submit it. This will mess up tile data, adding a 'random' tile next to the water and letting you walk/cycle on water by passing it.

You can actually get the '???' and non-blank fields after taking off Kadabra's mail and giving another Pokémon mail (possibly one that didn't have mail before) from anywhere. Walking on water is one application of it, but there may be more.

Thanks to 0xwas for these glitches:
https://www.youtube.com/watch?v=4UhHCr4yIqc - Glitch 1 and 2
https://www.youtube.com/watch?v=R5KR_Y5-HOQ - Glitch 3

Addendum:

During tile corruption, the mail fields determine the coordinates of corrupted tiles, and the phrase determines what type of tile you get.

Field 1 - 06 0C
Field 2 - 07 0C
Field 3 - 08 0C
Field 4 - 09 0C
Field 5 - 0A 0C
Field 6 - 0B 0C
Field 7 - 0C 0C
Field 8 - 0D 0C
Field 9 - 0E 0C

With the tile corruption, you can hack in a Secret Base tile on Route 117 and battle a glitch Trainer, using field 5 and the phrase "Golduck" (ゴルダック). https://www.youtube.com/watch?v=5fgE2D8M4dU

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