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Trade link up shore encounter trick
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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 | Generation IV item cloning glitch (Japan only) | 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) | 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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Bulbapedia also has an article about Trade link up shore encounter trick.

The trade link up shore encounter trick is a derivative glitch of the left-facing shore tile glitch in non-Japanese (including at least the English version) Pokémon Red and Blue.

By choosing to trade with another player and then exiting the Cable Club with the Cable Club blackout glitch before surfing on the left-facing shore tiles (such as on Route 20; east of Cinnabar Island), the player can encounter Pokémon mainly based on the name of the player the user linked with.

The glitch was documented by Pepjin de Vos and researched further by Torchickens (ChickasaurusGL).

Summary

The trade link up shore encounter trick allows you to get Pokémon you wouldn't be able to obtain with the old man trick with your own name (the encounters which are based on). Instead, this glitch lets you get Pokémon with another player's name who you link up with, with some unexplained complications.

So for instance, if your name is YELLOW, you normally can't get the fossil and ghost Missingno. with the old man glitch. However, if you linked up to someone called wwwxxyy, (because the w x and y correspond to their index numbers and are in position 3, 5 or 7) you could obtain all three.

When you choose to trade or battle with a player in the Cable Club (bringing up the trade screen or the battle is important), their name is stored in the grass Pokémon data that can be encountered with a left-facing shore tile, similar to how in the old man trick it is the player's name that is stored in the grass Pokémon data.

When you reset the game after bringing up the trade screen or battle screen, then the data is reset back to normal, regardless of whether you traded or not.

But if you exploit the Cable Club escape glitch after viewing the trade screen and exiting, you can exit the Cable Club and keep the name based encounter values.

After performing the Cable Club escape glitch, you can change boxes, then save and reset the game to get the ability to save via the start menu back and use items back. This still keeps the name based encounter values; then you can (fly to Cinnabar) and surf along the Cinnabar Island coast.

The mechanics of this glitch are mainly the same as the old man glitch except with another player's name, i.e.

  • Letter 2 determines the level of the first Pokémon
  • Letter 3 determines the species of the first Pokémon
  • Letter 4 determines the level of the the second Pokémon
  • Letter 5 determines the species of the second Pokémon
  • Letter 6 determines the level of the third Pokémon
  • Letter 7 determines the species of the third Pokémon
  • Letter 8 determines the level of the fourth Pokémon
  • Letter 9 determines the species of the fourth Pokémon
  • Letter 10 determines the level of the fifth Pokémon
  • Letter 11 determines the species of the fifth Pokémon

For unknown reasons a huge amount of data is written to the rest of the encounter table (and the water encounter rate) with this method, as well as unrelated data that follows.

The source of the corruption to the rest of the encounter table beyond Pokémon 11 is unknown. In wild grass encounters (which apply to the left-facing shore tile), we can actually encounter 10 Pokémon (though some are the same) - 5 more than what old man trick normally allows us to manipulate, according to DataCrystal's documentation of wild encounters.

Below is a real example:

Uncommon battles:

  • Glitch Trainer $FD with 'level' value 0
  • Glitch Trainer $FD with 'level' value FD (x2)

Rare battles:

  • Kabutops Fossil Missingno. ($B6) level 253
  • Kabutops Fossil Missingno. ($B6) level 182

Other tricks related to the old man trick:

1) One can encounter the grass encounter data from a previous location (e.g. the Safari Zone) by last visiting there, flying to Cinnabar Island and surfing along the coast.

2) When you perform an in-game trade, it means that the grass encounter data is overwritten with 5D 50 50 50 50 50 50 50 50 50 50. 5D is a control character that prints "TRAINER" - the OT name of every in-game trader. 5D (the grass encounter rate) is overwritten to 00 when you go to Cinnabar Island but is irrelevant for the glitch. The rest of the data means that you always encounter five level 80 (hex:50) Missingno (hex:50) if you perform an in-game trade then surf on the Cinnabar Island coast without updating the encounter data.

You may encounter Pokémon from the last area as well though via this method, due to only the first eleven bytes of encounter data being overwritten.

YouTube video

YouTube video by ChickasaurusGL
YouTube video by Pepjin de Vos