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Second type glitch
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From Glitch City Laboratories

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Major glitches of the Pokémon series

GB.png Arbitrary code execution GB.png

0x1500 control code arbitrary code execution (Crystal) | Cart-swap arbitrary code execution | Generation I custom map script pointer | Generation I invalid meta-map scripts | Generation I item ("8F", "ws m", "-g m", "5かい", "てへ" etc.) | Generation I move ("-", "TM42") | Generation I Trainer escape glitch text boxes | Generation II bad clone | Generation II Burned Tower Silver | Japanese Crystal Pokémon Communication Center SRAM glitches | Coin Case glitch | Generation II glitch Pokédex sortings | Pikachu off-screen glitch ACE | OAM DMA hijacking | Pikachu glitch emote | Generation III glitch Pokémon summary | Generation III glitch move animation) | Remote code execution | TM/HMs outside of the TM/HM pocket | ZZAZZ glitch Trainer FC

Bulbasaur.png No further extensions Bulbasaur.png

Cloning | Item duplication glitch (Generation I) | Pokémon merge glitch ("Q Glitch", Generation I) | Time Capsule exploit | Bug-Catching Contest data copy glitch (Generation II, Japan only) | Berry glitch | Battle Tower Lati@s glitch (Generation III) | (Mimic) Transform Rage glitch (Generation IV)

Transform held item glitch (Generation IV, Japan only) | Mimic glitch (Generation IV, Japan only)

Bruno.png Buffer overflow techniques Bruno.png

99 item stack glitch | LOL glitch | Rival LOL glitch | Instant LOL glitch | RAM LOL glitch | Out of bounds LOL glitch | 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 | Party Pokémon box data shift glitch | Unterminated name glitch item instant encounter (Japanese Red/Green)

Ball.png Item stack duplication glitch (Generation I) Ball.png

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

PC.png Bad clone glitch (Generation II) PC.png

????? 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 (Wrong pocket TM/HMs, Glitch Pokédex categories))

Lab pass.png Closed menu Select glitches (Japanese Red/Green) Lab pass.png

Dokokashira door glitch (International) | Fossil conversion glitch (international) | Second type glitch | Skip to Level 100 glitch | Trainer mutation glitch | Walk through walls (International) | Lift glitch | Badge describer glitch

Gromeg berry.png Pomeg glitch (Generation III) Gromeg berry.png

Pomeg data corruption glitch ("Glitzer Popping") | Charm glitch

Darkrai.png Voiding (Generation IV) Darkrai.png


Broken escalator glitch (Japan only) | Elite Four door glitch (Japan only)

Lying old man.png 2x2 block encounter glitches (Generation I) Lying old man.png

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) | Viridian Forest no encounter grass tiles glitch

Glitchtile.png Glitch City Glitchtile.png

Safari Zone exit glitch | RAM manipulation | Out of bounds Glitch City (Generation II) | Slowpoke Well out of bounds corruption (French Gold/Silver/Crystal)

RBYPC.png Large storage box byte shift glitch RBYPC.png

Storage box remaining HP glitch | Generation I max stat trick

Pikachu.png Pikachu off-screen glitch Pikachu.png

Trainer corruption glitch

Tereka.png SRAM glitches Tereka.png

Generation I save corruption | 255 Pokémon glitch | Expanded party encounter table manipulation (Generation I) | Send party Pokémon to a new game (Generation I) | Generation II save corruption | Mailbox glitches | Mystery Gift item corruption | Trainer House glitches

Ditto.png Trainer escape glitch Ditto.png

Death-warp | Ditto trick | Experience underflow glitch | Mew trick | Text box ID matching | Meta-map script activation

Brock.png Walk through walls Brock.png

Ledge method | Museum guy method | Rival's effect | Select glitch method (International Select glitch method), Brock Through Walls

Surf.png Surf down glitch Surf.png

Grass/rock Surfing glitch (Spanish/Italian only) (adaptions: Submerge glitch (international)) | 8 8 (0x7C) grass/rock surfing glitch (English Red/Blue))

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Bulbapedia also has an article about Second type glitch.
Please note that this glitch only exists in the Japanese versions of the game, or is otherwise a glitch
from a Pokémon game which was only released in Japan.

The Second type glitch is a closed menu Select glitch in Pokémon Red, Green, and Pokémon Blue (Japanese).

It allows the player to transform a Pokémon into another Pokémon with the ID of its second type. As single-typed Pokémon have their second type the same type as the first type internally, they can also be used for the glitch.


Item 13 method (does not always work):

1) Press Select on item 13.

2) Exit with B, B.

3) Open the Pokémon menu via a battle, Day Care on Route 5 or the Name Rater in Lavender Town and press A on the first Pokémon to swap it to be a Pokémon based on its second type.

This glitch may also trigger Pokémon No. 152 in the Pokédex.

YouTube video by The Exiled Force

Item 14 method:

1) Prepare a party of two Pokémon with the second-type you need.

2) Press Select on item 14.

3) Exit with B, B.

4) Open the Pokémon menu via the Day Care man on Route 5.

5) Press A on Pokémon 1 to swap it with a glitch Pokémon, and then raise and take back Pokémon 1.

6) Repeat steps 2-4 with the other non-glitch Pokémon and then press A on Pokémon 1 to swap it with the desired Pokémon.

YouTube video by ChickasaurusGL


Index number (dec) Index number (hex) Type Pokémon
000 00 Normal-type "A" (Japanese 'M (00))
001 01 Fighting-type Rhydon
002 02 Flying-type Kangaskhan
003 03 Poison-type Nidoran♂
004 04 Rock-type Clefairy
005 05 Ground-type Spearow
006 06 Bird-type Voltorb
007 07 Bug-type Nidoking
008 08 Ghost-type Slowbro
020 14 Fire-type Arcanine
021 15 Water-type Mew
022 16 Grass-type Gyarados
023 17 Electric-type Shellder
024 18 Psychic-type Tentacool
025 19 Ice-type Gastly
026 1A Dragon-type Scyther
033 21 ヌ゙る* Growlithe


Thanks to Japanese Pokémon select button glitch websites, Meowth346 for discussing this glitch on the Azure Heights forums in 2001, gunbladelad77 for sharing it on GameFAQs in 2009 and then finally ginothepro for uploading footage of it on a real Game Boy in 2012.