Dokokashira door glitch: Difference between revisions
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{{Select
{{Japan only}}
{{bulbapedia2|dokokashira door glitch}}
[[Image:Dokokashira 8.png|frame|right|After the player activates the dokokashira door glitch, Professor Oak will appear outside. Talking to him makes him say his speech for if the player tried to walk into one of the first two available grass tiles with no Pokémon, but nothing noticeable happens after that.]]
The '''dokokashira door glitch''' (Japanese: どこかしらドア, ''dokokashira door'') is one of the most popular [[select glitch]]es in Japan, and it is the most well known select glitch outside of Japan. It can only be performed in
The name 'dokokashira door'
This glitch allows the player to warp to almost anywhere in the game, including the Hall of Fame, simply by walking around. The glitch can be pulled off very early in the Japanese games except Yellow, and it has been utilized in both real time and tool-assisted speedruns of the games.
The dokokashira door glitch, though allowing the player to enter the Hall of Fame quickly, is not the fastest way to complete any Generation I game. The [[
==Emulation issues==
This glitch will not work on earlier versions of VisualBoyAdvance{{elaborate}}, but [http://tasvideos.org/forum/viewtopic.php?t=2050&postdays=0&postorder=asc&start=280 a fix] was posted by Dwedit on the TASVideos forums, where the dokokashira door glitch works. The problem [http://tasvideos.org/forum/viewtopic.php?t=5116&postdays=0&postorder=asc&start=20&sid=00248fb1c764101befa6cbbd41a1254a was speculated to be] because of incorrect Echo RAM emulation.
Another working version is the re-recording emulator vba-v24m-svn422 and likely others. The dokokashira door glitch will work on BGB (at least version 1.4) and on a real Game Boy system.
==Methods for warping to the Hall of Fame==
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#A Japanese version of Pokémon Red, Pokémon Green or Pokémon Blue. Pocket Monsters Pikachu and the localizations will not work.
#Two items in the items pack (these will be
#One Pokémon.
===Initial steps===
1. Start a new game and withdraw the potion from your PC, or obtain a potion from the NPC on Route 1, and continue the game normally until you obtain Oak's Parcel. The number of Potions you get does not matter.
1. Open the items pack outside of battle. If you are using [[revision differences in Generation I|version 1.0]] of Pocket Monsters Red or Green (your cartridge will have a 00, 20 or 22 written on it), then you can perform the first step of this glitch by selecting an item from within battle, but the ability to swap Pokémon or invalid Pokémon around from directly in battle was removed in revision A (12A or 22A on the cartridge) and Pocket Monsters Blue.<br>▼
▲
[[File:Dokokashira 1.png]]
[[File:Dokokashira 2.png]]
[[File:Dokokashira 3.png]]
[[File:Dokokashira 4.png]][[File:Dokokashira 5.png]]
[[File:Dokokashira 6.png]]
[[File:Dokokashira 7.png]]
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#Proceed eastwards to [[bp:Celadon City|Celadon City]]. Stop when the palette changes and the music changes to Celadon City's theme.
#Walk two steps right, four steps up, eight steps right, and one step up, landing the final step on the right-most Celadon Department Store door. You will warp directly to the Hall of Fame, and it will register your Pokémon even though it looks glitchy.
===Method #3===
This method makes use of only one 'dokokashira warp', but it takes many steps.
#Activate the glitch in [[bp:Kanto Route 1|Route 1]] and enter Pallet Town (the music and palette will change).
#Enter Professor Oak's lab.
#F335 (Echo RAM for D335) will change to FF. Walk 548-551 steps (137×4) and land the last step through the right exit mat warp. Ignore any '(x)は ちからつきた' (fainted Pokémon) messages on the way.
The player will warp directly to the Hall of Fame. If they want to pass through Blue's Pokémon League room, they can walk eight steps less.
It may be easier to count 136 sets of four steps to the right wall/back to the mat, or 68 sets of eight steps to the right wall ''and'' back to the mat. Afterwards, the player can walk four more steps and land their last step through the right mat exit.
==Eevee Trick==
The Eevee Trick, discovered by [[user:Pawny|Pawny]] (among non-Japanese native people{{clarify}}) allows you to 'patch' the effects of the Hall of Fame on your save file. It also allows you to get up to 25 Eevee. After you watch the credits after warping to the Hall of Fame and reload your save file, you will be outside of your house with the dokokashira door glitch's warping effect still active.
Travel the same amount of steps required to warp to Route 7, then travel to the right-most back entrance of the Celadon Mansion and enter it (the amount of steps required to enter the mansion don't really matter). Do not enter the left-most entrance or you'll warp to somewhere else.
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This select button glitch involves the player putting the end party terminator (hex:FF) at the top of the party. Before the player delivers Oak's Parcel, they must have only obtained one Pokémon in normal circumstances, so the end party terminator directly follows the first Pokémon.
When the player swaps the second Pokémon with the first via the select button glitch with a Potion and Oak's Parcel (this involves highlighting the second item with select, exit with B, B, entering battle, going to 'Pokémon' and pressing A on the first Pokémon to swap it) it confuses the game into thinking that Pokémon past the sixth position are real Pokémon because the terminator located at D125 (second Pokémon) is missing. In actuality, their data is not used for real Pokémon data and the data is used for other things, as the game uses simple extrapolation.
The terminator is normally placed at the address D123 (number of Pokémon) plus its value, plus one, so here it is at D123+1+1=D125.
Some of these Pokémon may be poisoned, so whenever the player walks four steps, the game will likely decrease a certain value following the sixth Pokémon data by 1, thinking it was a Pokémon's hitpoints data, but it is the hitpoints of no valid Pokémon. The HP reduction cannot occur where there is an FF, and the process only affects values before the first FF from D124 (the second Pokémon).
When performing the glitch just after obtaining Oak's Parcel from a newly made save file, there will be many non FF values past the address D124, and the first FF value will be located much further on from that address
In order to alter the wrong warps every four steps, three criteria are necessary.
On a later save file that has made certain progress, it may be impossible to pull off the warping around part of the glitch. This is because there may be addresses in the memory preceding D335 which are FF.▼
*The 199th Pokémon must be poisoned (F337 (Echo RAM for D337) must have bit 0x3 set; as it does for the 0x0C value loaded into D337 upon entering Pallet Town). Note that even though this Pokémon is in fact poisoned, the poison screen transition/sound effect may not occur. D337 is the x-coordinate of the Professor Oak's laboratory door warp.
If the player has obtained more than one Pokémon, there will normally be FFs following the number of Pokémon they have in the party even if the current number of Pokémon is less than the most Pokémon they had in the party in the past. If the player obtains the most amount of Pokémon they previously had in the party through the storage box (at most 6), they can pull off the glitch by swapping [number of Pokémon in the party +1] with the first Pokémon, but there may still be addresses before D335 that are FF, so the warping may not work. The 'Professor Oak is outside' part of the glitch may work without the warping.▼
*F334/F335 (D334/F335) (the 199th Pokémon's current HP; 0 to 65535) must first be a 16-bit value greater than 0 (otherwise the wrong warp is always Pallet Town because poison does not underflow a fainted Pokémon's HP).
**Additionally, if it is possible to adjust F334 to a value over 0 (so F334-F335 represents 256*n as the HP where n>0, it is possible to access relatively high warp IDs as in this case, F335 will wrap around from 0x00 (Pallet Town) to 0xFF ([[AreaDexJP/RG:255|glitch map 255]]) and below whenever F334 is decremented (a loss of 256 HP). From 0xFF it will take 255*4 steps to become 0x00, after which taking another four steps decrements F334 by 1 and sets F335 to 0xFF. This process of having to walk 256*4 steps to underflow from 0x00 from 0xFF repeats, until F334 becomes 0x00 as well - from there on the wrong warp is always Pallet Town as above.
*There must be no 0xFF before D1EA and after D124.
F335 (Echo RAM for D335) stores the map that the player will warp to when they enter a 'dokokashira warp' (see the [[Dokokashira door glitch#Planning a path|planning a path]] section for more information). F334 is the index number of the entrance point ('index') of the map, for instance a value of 0x00 is the left-side of the carpet in Blue's house, and 0x01 is the right-side of the carpet.
▲On a later save file that has made certain progress, it may be impossible to pull off the warping around part of the glitch. This is because there may be addresses in the memory preceding
▲If the player has obtained more than one Pokémon, there will normally be FFs following the number of Pokémon they have in the party{{clarify}} even if the current number of Pokémon is less than the most Pokémon they had in the party in the past. If the player obtains the most amount of Pokémon they previously had in the party through the storage box (at most 6), they can pull off the glitch by swapping [number of Pokémon in the party +1] with the first Pokémon, but there may still be addresses before
===Planning a path===
Based on the mechanics above, the following equation can be used to calculate the map ID that you will end up:
MapID = [value in memory address F335 (D335)]-(Steps/4)
"MapID" is the index number of the map you want. For a list of index numbers, see Bulbapedia's [http://bulbapedia.bulbagarden.net/wiki/List_of_locations_by_index_number_(GB) list of Generation I locations by index number].
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"Steps" is the number of steps you need to take.
There will be one (or possibly more) 'dokokashira'
Please refer to the following table for a list of map constants and 'dokokashira' warps:
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{| border="1"
!Location
!Map constant (
!The warp location
|-
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==See also==
#[[International 'dokokashira door glitch']]
#[[Select glitch]]
#[[Tweaking]]
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==Trivia==
*The name 'dokokashira door' is similar to 'Dokodemo Door' (Japanese: どこでもドア, ''anywhere door''), a gadget from the manga and anime [[wp:Doraemon|Doraemon]] which is popular in Japan. The Dokodemo Door allows others who enter it to warp to an arbitrary distant place.▼
▲*The name 'dokokashira door' is similar to 'Dokodemo Door' (Japanese: どこでもドア, ''anywhere door''), a gadget from the manga and anime
[[Category:Speed Runner Glitches (Green)]]▼
[[Category:Major glitches]]
[[Category:Generation I glitches]]
[[Category:Speedrunner glitches]]
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