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Grass/rock Surfing glitch
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Major glitches of the Pokémon series

Arbitrary code execution (template, remote, cart-swap) | 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 (????? 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) | Generation IV item cloning glitch (Japan only) | Glitch City (Safari Zone exit glitch, RAM manipulation) | 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 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) | Zapdos LV68 glitch | ZZAZZ glitch (party Pokémon box data shift glitch)

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Please note that this glitch only exists in the Spanish and Italian versions of the game. Spain.pngItaly.png

The Grass/rock Surfing glitch applies to Spanish and Italian versions of Pokémon Red and Blue only. It does not work in any localization of Pokémon Yellow.

Steps

1) Encounter a Trainer, and then perform the Surf down glitch to surf into the grass or a rock tile (i.e. a rock in Cerulean Cave. To do this, press Start whilst walking towards the water's edge, then save and when you reset the game Surf will go down as its neutral position.

2) Use Surf to go down into the grass or a rock tile, then carefully spin around to try and encounter a Pokémon. If you fail simply reset the game. The Pokémon found depend on the Trainer.

Mechanics

The Pokémon in the grass or rock tile are taken from memory addresses D8A9 (the equivalent of D8A4 in English versions) onward, which is usually reserved for water encounters.

Upon fighting a Trainer this area of the memory is written to (in a similar fashion to the old man's demonstration writing to grass encounters in the old man trick).

Hence Trainer data can affect the water encounters in a location in which there are normally no water encounters, such as Route 24 north of Cerulean City.

For illustration is an example of a Jr. Trainer♂ on Route 24.

Route 24 Jr Trainer Squirtle.png

His data is written into $D8A9 in memory, which maps out in the following way for Jr. Trainer♂ data and water encounter data.

Code; $D8A9... $B1 $00 $32 $00 $00 $15 $15 $2d $21 $27 $91 $37 (PLAYER'S) (PLAYER'S)
Jr. Trainer♂ data Squirtle 0x00XX current HP 0xXX32 current HP Unknown byte Status Type 1 Type 2 Unknown byte Move 1 Move 2 Move 3 Move 4 Trainer ID byte 1 Trainer ID byte 2
Water encounter data Encounter rate=B1 Water Pokémon 1 level = 31 Water Pokémon 1 species= 32 (MissingNo.) Water Pokémon 2 level =00 Water Pokémon 2 species = 'M (00) Water Pokémon 3 level = 21 Water Pokemon 3 species = $15 (Mew) Water Pokemon 4 level = 45 Water Pokemon 4 species = $21 (Growlithe) Water Pokemon 5 level = 39 Water Pokemon 5 species = $91 (Golem) Water Pokemon 6 level = 55 Water Pokemon 6 species = any Water Pokemon 6 level = any
Code; D8B7 $00
Jr. Trainer♂ data Experience byte 1
Water encounter data 'M (00)


YouTube video by ChickasaurusGL

History

According to Paco81, the grass/rock Surfing glitch was documented on a Spanish forum as "Missingno trick for Spanish versions" and he originally thought it was a fake trick, until his friend stumbled across a wild Pokémon glitch with it.

On the Spanish Pokémon Stats forum Paco81 started a thread called "¿Tentacools en la hierba?" (Tentacools in the grass) mentioning the glitch, and people did research on it and found that Pokémon other than Tentacool can appear in the grass. Paco81 found that this is based on the last Trainer you encounter.

In English versions

Main article: English grass/rock Surfing glitch

Using the glitch items 9F (hex:5E), 8 8 (hex:7C) and a Rival's effect item such as E tE (hex:94) one can 'port' a glitch like the grass/rock Surfing glitch into English versions.

YouTube video by ChickasaurusGL

External links