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Left-facing shore tile glitch
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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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Pokémon from the previous Pokémon list can be encountered on Cinnabar's east coast.

The left-facing shore tile glitch is a 2x2 block encounter glitch in Pokémon Red and Blue, that allows the player to encounter Pokémon in the wrong place. The Pokémon originate from the last location with grass tiles visited in memory.

A few 'left-facing shore tiles' may bring up a Pokémon from the last area that the player visited, either when the player either surfs on them, or walks on them (via a walk through walls glitch, such as the ledge method).

In the Italian and Spanish versions of Pokémon Red and Blue, the trick works, but the player has to use a walk through walls trick (ledge method) and walk on the left-facing shore tile, otherwise (if the player was just surfing) they will encounter Tentacool.

In the French and German versions, the left-facing shore tile glitch works normally. In all versions of Pokémon Red, Green, and Pokémon Blue (Japanese), as well as Pokémon Yellow the glitch seemingly does not occur. In these versions, apparently no Pokémon can be encountered on the shore tiles that work in other versions.

Working shore tiles

  • The tiles directly east of Cinnabar Island.
  • The tiles east of the right-most Seafoam Islands cave.
  • The left-facing shore tiles in a Sea Route 19 Glitch City.

Applications

Exeggcute encountered outside of the Safari Zone battle mode.

1. Battling Safari Zone Pokémon in the normal battle mode. It is referred to by Nintendo as the "Fight Safari Zone Pokémon trick".

2. The old man trick lets you store your name data in the grass tile data. This allows you to encounter certain, and often, high or over level 100 Pokémon, including a few rare Pokémon like Mewtwo, as well as glitch Trainers and variants of the glitch Pokémon Missingno. 'M (00) is also possible, but it cannot be encountered with a pre-set name that was chosen from the new game screen and wasn't input manually.

Missingno. and 'M (00)'s invalid encounter flags enable duplication of the sixth item after encountering them or capturing them, provided that there are less than 128 items in the sixth slot.

In German Red/Blue, the letters Ä (hex:C0), Ö (hex:C1), Ü (hex:C2), ä (hex:C3), ö (hex:C4) and ü (hex:C5) can be entered on the 'your name' screen, and these can be used to encounter glitch Pokémon with index numbers from 192-197 if one of the letters is the third, fifth, seventh, ninth or eleventh character, but the hex:C2 and hex:C5 glitch Pokémon (may) freeze the game on encounter.

The old man trick can be used to convert the fourth item into a few other items if the player has a name that lets them encounter a Trainer, and the identifier of the fourth item is not $1X, $3X, $5X, $7X, $9X, $BX, $DX, or $FX. This requires fighting a Rocket on Silph Co.'s 11F first.

The Trainer has level 250 Pokémon, and may use a Super Glitch inducing move, so a high level Pokémon with a one-hit KO move, X Speeds and an X Accuracy is recommended as it's otherwise impossible to defeat all of their Pokémon in one hit, and after the Super Glitch effect happens, the Trainer can send out the Pokémon that just fainted.

For more information, see 94's item conversion.

Cause

The left-facing shore tile glitch occurs because apparently the the left side of the 2x2 block ('shore') controls the type of Pokémon encountered (grass list, water list or none) with 'shore' counting as grass encounters, and the right side of the 2x2 block ('water') controls the encounter rate used (grass rate, water rate or none) with water counting as water rate encounters. Since the water encounter rate for Route 20 is not 0 and grass encounters are used, the player is free to encounter unintended Pokémon on the left-facing shore tile from leftover grass encounter data.

Left-facing shore tile data.png