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Pikachu off-screen glitch
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This article is a summary page for different variations of a glitches, etc. when talked about as a whole.
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Pikachu off-screen glitch, also Pikawalk, Pikachu's glitch ([1]) refers to a number of natural glitches in Pokémon Yellow, in which the player walks around while Pikachu is off the screen and data is corrupted from D438 onward, with values based on the steps that the player made.

It also refers to glitches to put Pikachu off the screen from glitch items such as Rival's effect and Lg- (hex:6E), or exploring a Glitch City, which allow the player to perform the glitch anywhere easily.

The glitch item and Glitch City methods were discovered by Paco81 and Torchickens, and the natural glitches later discovered by Sally. Pikachu off-screen glitch text box arbitrary code execution was discovered by stumpdotio. The Pikachu off-screen Trainer corruption glitch was discovered by LanceandMissingno.

Pikachu off-screen glitch is also an exploit from glitch items such as Rival's effect and Lg- (hex:6E), or exploring a Glitch City, which allow the player to perform the glitch anywhere easily.

Natural glitch exploits

You can trigger Pikachu off screen glitches without a glitch item or a Glitch City.

The off-screen glitches in this section only require an event in normal gameplay that makes Pikachu stay.

Events that make Pikachu stay

1) Talking to the Pewter City Pokémon Center Jigglypuff. (can be done at any point in game)

2) Two Bill's house "Poké-Bill" events.

3) Going into the Pokémon Fan Club in Vermilion City and having Pikachu fall in love with Clefairy.

Possible glitches

1) Getting stuck in a Glitch City, known as a Super Glitch City.

2) A freeze which may destroy the save data.

3) A Pikachu exclamation appearing and Pikachu getting stuck out of bounds (Bill event, Clefairy event).

4) Letting Bill give you the S.S. Anne ticket as a Pokémon. You have to write 02 to D4E4, so you need to walk up (up has a value of 02) after a certain number of steps with Pikachu off screen.

5) Causing NPCs to move when they shouldn't.

Youtube Video:

YouTube video by ChickasaurusGL

Glitch text box activation and arbitrary code execution

Main article: Arbitrary code execution#Via Pikachu off-screen glitch

By using the Pikachu off-screen glitch and making specific movements to force the non-existing sign 04 to appear at coordinates x=1, y=1 in the Vermilion City Fan Club, it is possible for the player to execute arbitrary code beginning from D221; the catch rate/held item of party Pokémon 5.

Outside of speedrunning, a Graveler with 08 c2 (2242) HP stat experience and 1d d3 (7635) Attack stat experience may be used as an applicable Pokémon 5.

To get these specific EVs, your Pokémon needs to have encountered the following Pokémon (and no more):

71 Krabby, 1 Farfetch'd, 1 Dugtrio, and 1 Magnemite.

(Thanks FMK for working out what Pokémon to battle).

This technique was discovered by stumpdotio, originally for speedrunning Pokémon Yellow using a different method. A video of the route by Dabomstew's may be found here.

YouTube video by ChickasaurusGL

Via glitch items

Applicable glitch items for the Pikachu off-screen glitch include:

  • The glitch item Lg- (hex:6E) - makes Pikachu stay.
  • The item 9F, hex:5E - makes Pikachu stay but may cause a Glitch City in some places. Thanks EstebanZD Glitcher.
  • A Rival's effect (Jack effect) item, such as hex:94 - doesn't make Pikachu stay but can put him off the screen and desync him. Thanks luckytyphlosion.

Lg- is available through item underflow glitch and pPkMnp' ' (special 194)'s mutation of the fifth item when it's a Super Rod.

Additionally, all glitch items are available through an item underflow glitch and the Celadon looping map trick.

Via Glitch Cities

The Sea Route 20 Glitch City from the Safari Zone exit glitch first has Pikachu off the screen when you appear on the map. Making two steps down and walking left/right will keep Pikachu off the screen and corrupt data from D438.

YouTube video by Pacoo81

Corruption details

The more steps the player takes the more values are corrupted from D438, and each value depends on how the player makes a step. After the game reaches D536 (address may vary) it is assumed no bytes further than it are corrupted and the corruption starts again from the beginning. To corrupt this far the player will likely need walk through walls enabled, either via a glitch or cheating.

The values are as follows:

  • South=01
  • North=02
  • West=03
  • East=04

Tricks

Set Pikachu's happiness (D46F) to a low value 01-05

Walk 56 steps with Pikachu off-screen.

Get 255:59 hours play time

This is for the Sea Route 20 Glitch City method, but may occur through other methods as well. With Pikachu off-screen, walk to the door in the Safari Zone exit Sea Route 20, then one tile west of the left-most of two "H"s, and repeat.

Cause a Super Glitch City

Walk 244 steps or so with Pikachu off-screen.

Make Pikachu do the winking emote. (D49B=01)

With Pikachu off-screen, step south after walking 99 steps (Lg- or 9F), then talk to Pikachu. If you're using the Rival's effect item this is much easier, because it forces the game to think all of Pikachu's movements are 01 if you use it when Pikachu is facing down and don't cancel out from the 'party sprites on screen out of menu' effect.

Make Pikachu do the fishing emote (D49B=02)

With Pikachu off-screen, step north after walking 99 steps (Lg- or 9F), then talk to Pikachu. If you're using the Rival's effect item this is much easier, because it forces the game to think all of Pikachu's movements are 02 if you use it when Pikachu is facing up and don't cancel out from the 'party sprites on screen out of menu' effect.

Make Pikachu do the confused emote (D49B=03)

With Pikachu off-screen, step west after walking 99 steps (Lg- or 9F), then talk to Pikachu. If you're using the Rival's effect item this is much easier, because it forces the game to think all of Pikachu's movements are 03 if you use it when Pikachu is facing west and don't cancel out from the 'party sprites on screen out of menu' effect.

Make Pikachu do the disapproval emote (D49B=04)

With Pikachu off-screen, step east after walking 99 steps (Lg- or 9F), then talk to Pikachu. If you're using the Rival's effect item this is much easier, because it forces the game to think all of Pikachu's movements are 04 if you use it when Pikachu is facing east and don't cancel out from the 'party sprites on screen out of menu' effect.

Max out Pikachu's happiness (D46F=FF)

1) Activate a walk through walls glitch, such as the ledge method. The museum guy method might work too. 2) Go to this position a certain position[clarification needed] and step left. 3) Make 56 steps by walking one step up, and then one step down (i.e. go up, then down, then up, then down, then up, then down). 4) Make one step right so you're back in Fuchsia City and wait for a while. Bytes from D438-D46F will fill up with FFs, and since happiness is D46F, Pikachu happiness maxes out.

Pikachu off-screen glitch Trainer corruption glitch

This technique was discovered by LanceandMissingno.

Corrupting addresses D4E3 onward (making 171+ steps with Pikachu off the screen) corrupts NPC Trainer data for the current map in the format class of Trainer 1, text of Trainer 1, class of Trainer 2, text of Trainer 2, etc.

Addresses D503 onward control NPC Trainer data for the current map in the format class of Trainer 1, roster of Trainer 1, class of Trainer 2, roster of Trainer 2, etc. Unlike the earlier addresses if you change these class addresses it will actually change the Trainer class, and values below 200 (C8) do not result in Trainers but rather Pokémon. Plus you can change the roster (if Trainer) or level (if Pokémon).

At least some of the Trainer information addresses are in the range of corruption from the off-screen glitch.

So, by walking a specific number of steps with Pikachu off-screen and doing the last step in a certain direction, you can encounter Pokémon 01-04 (Rhydon, Kangaskhan, Nidoran♂ and Clefairy). If you're using Lg- this is easiest to pull off as long as you walk around with Pikachu off the screen after he stays and don't save and reset after.

But if you do save and reset it may cause problems for getting one of these Pokémon where Pikachu will start walking around and FF/other value corruption occurs.

There is a workaround to this via the Rival's effect item. You have to use the item when facing the direction/value you want (e.g. south=01). This would cause values to be written as 01 regardless of the direction you take when Pikachu is invisible, and make it so that the FF/other value corruption is minimal by making Pikachu invisible until only he is close to the Trainer you corrupt, and then quickly/without much steps talk to the Trainer.

You can battle an FF glitch Trainer if the FF corruption (caused by Pikachu walking around in unexpected ways after previously being on screen) happens in the right address and doesn't change. But if it's roster FF, it won't be a ZZAZZ glitch Trainer, just a regular FF glitch Trainer. Certain rosters for Trainer FF like roster 8 are ZZAZZ glitch Trainers however.

It is possible to battle level 255 Pokémon if you FF corrupt the roster/level with the Rival's item, somehow get Pikachu to re-appear by opening/closing the Pokémon menu after Pikachu is invisible, then start to walk around with Pikachu off the screen again just until corruption of a Trainer class (or Pokémon if less than C8) but not their roster (level).

YouTube video by ChickasaurusGL