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A successful tweak.

Tweaking is a glitch exclusive to the core series Generation IV games that causes the game to fail to load the graphics of an area. It is also sometimes referred to as holepunching to commemorate its discoverer, a GameSpot forums member by the name of "Holepunch".


All maps in Generation IV are broken up into square "sections" or "chunks" 32 tiles by 32 tiles across. At any given time, only four sections are loaded and visible. 'Load lines' exist halfway across each section, so named because when the player crosses over one, the sections in that direction are loaded into memory, while the sections behind the player are unloaded. Through this, the overworld appears seamless.

Using the Bicycle in the fourth gear, however, can cause the player to move too fast for the game to load the areas properly, especially if one changes direction several times while near the intersection of two load lines, thus loading and unloading multiple sections over and over nearly simultaneously. Doing so triggers a race condition bug, causing sections to load improperly. The effects can vary from a game freeze, invisible walls, a completely black area, a completely white area, a change in the Z-axis location, or even a completely different section fully loading in the wrong place.

The distortion caused by tweaking can be solved easily by crossing a load line away from the distortion, causing it to unload. When the section is loaded again, it will be normal. It can also be solved by looking at a different menu screen such as the Pokédex; upon closing out of the menu, the areas will be properly reloaded.

While tweaking using the bicycle in the fourth gear is the most common method to perform tweaking, the same effects can also occur using only the third gear, although its applications are not as widespread. It is even possible for some limited effects to occur simply by running, mainly invisible walls and Z-axis changing rather than drastic graphical changes.


Depending on the layout of a section, it is possible to tweak in such a way so as to load a walkable black area into a section that does not normally contain walkable surfaces. This allows for a number of shortcuts, such as skipping Tohjo Falls and therefore HM07 (Waterfall) in Pokémon HeartGold and SoulSilver by loading a black area onto the section where the ledge on Route 27 would normally be. In sections containing buildings that are blocked off by NPCs, it is possible to enter them by tweaking a Z-axis change, allowing the player to walk under or over the tile the NPC would normally occupy. An example of a shortcut using this method is bypassing the Team Rocket Grunt that blocks the Azalea Gym, therefore allowing the player to obtain HM01 (Cut) and proceed through Ilex Forest without having to enter Slowpoke Well or defeat Rocket Executive Proton inside.

These types of shortcuts are possible in all Generation IV games.

Void glitch

The void glitch is a specific application of the tweaking glitch only possible in Pokémon Diamond and Pearl. First, the player must tweak a black area onto a section that would normally contain buildings, making it possible to walk through their improperly loaded walls. Then, by standing exactly one tile above the entrance to a building, reloading the area, and walking south, the player can end up on the interior map of the building, but in the black void area around the normally accessible portion, similar to the Surf glitch. As with the Surf glitch, it is then possible to navigate through the interconnecting area of this void to normally inaccessible overworld locations, most notably Newmoon Island and the Flower Paradise, where the event-exclusive Darkrai and Shaymin reside.

The only known location where a path to Darkrai or Shaymin has been successfully found is the void area around the Pokétch Company building in Jubilife City.

As the player is required to save the game in the void as part of the path to access Darkrai and Shaymin, the same risks associated with the Surf glitch occur here, such as becoming trapped without a method of escape. More notably, as the maneuvers in the void necessary to reach Newmoon Island and Flower Paradise are significantly more elaborate than with the Surf glitch (with the complete path to Darkrai requiring about two hours and the complete path to Shaymin requiring about one hour), it is possible for more serious corruption-related effects to occur. In the worst possible circumstance, the game may always immediately freeze upon loading the save file, forcing a new game to be started.

It is currently believed, although not conclusively proven, that the Hall of Origin is impossible to access with this glitch, as it is a closed-off indoor area without a single entry warp, thereby making it almost impossible to safely locate in the void compared to outdoor areas and indoor areas with many warps such as Turnback Cave. Regardless, as with the Surf glitch, it is impossible to battle Arceus this way, due to several reasons (see here for more information).

Other areas that can be accessed through this glitch include the Hall of Fame, Giratina's room in Turnback Cave, and Route 227. As the void glitch simply requires a Bicycle to perform, all of these areas can be reached as early as the game's second Badge.

In Pokémon Platinum, HeartGold, and SoulSilver, navigating through the void is believed impossible due to the presence of unstable invisible walls and invalid[citation needed] tiles that cannot be stepped out of once entered. In addition, in Platinum, Darkrai and Shaymin will not appear in their respective areas unless the player has obtained the proper event item, making attempts to reach said areas futile even if the void were traversable or some other method of access found.


Tweaking in order to get Darkrai

By auburneye
Videos are currently unavailable on Bulbapedia; instead, you can watch the video on YouTube here.

Tweaking in order to get Shaymin

By auburneye
Videos are currently unavailable on Bulbapedia; instead, you can watch the video on YouTube here.

See also

Cloning glitchesGlitch PokémonGlitch types
Generation I: --0 ERRORCable Club escape glitchError codesExperience underflow glitchGlitch CityGlitch dimension
Glitch movesGlitch TrainersItem duplication glitchJohto guard glitchMew glitchOld man glitchPewter Gym skip glitch
Pokémon merge glitchRhydon glitchSelect glitches (dokokashira door glitch, second type glitch)
Super GlitchZZAZZ glitch
Generation II: Celebi Egg glitchCoin Case glitchesError codesExperience underflow glitchGlitch Egg
Johto guard glitchSketch glitchTeru-samaTrainer House glitchGlitch dimension
Generation III: Berry glitchDive glitchPomeg glitch
Generation IV: Acid rainGlobal Terminal glitchesMimic glitch
Pomeg glitchRage glitchSurf glitchTweaking
Generation V: Sky Drop glitchFrozen Zoroark glitch
Generation VI: Lumiose City save glitch
Glitch effects: Game freezeGlitch battleGlitch song
Gens I/II only: Japanese characters in the international versions
Gen I only: Glitch screenTMTRAINER effectInverted sprites
Gen II only: Glitch dimension
Lists: Glitch movesGlitch types
Glitch Pokémon (Gen IGen IIGen IIIGen IVGen VGen VI)
Glitches (Gen IGen IIGen IIIGen IVGen VGen VISpin-off)

Project GlitchDex logo.png This article is part of Project GlitchDex, a Bulbapedia project that aims to write comprehensive articles on glitches in the Pokémon games.