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Major glitches of the Pokémon series
"Core" glitch Variants and Consequences
Arbitrary code execution see template, remote, cart-swap, unintended ROM code execution
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 (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 (TM/HMs outside of the TM/HM pocket, Glitch Pokédex categories))
Berry glitch
Bug-Catching Contest data copy glitch (Japan only)
Ditto DV manipulation
Elite Four door glitch (Japan only)
Expanded party encounter table manipulation
Glitch City Safari Zone exit glitch, RAM manipulation
Glitch meta-map script activation (Generation I)
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
Transform held item glitch (Japan only)
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 data 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
SRAM glitches (Generation II) Mailbox glitches, Mystery Gift item corruption, Trainer House glitches
Surf down glitch Grass/rock Surfing glitch (Spanish/Italian only) (adaptions: Submerge glitch (international), 8 8 (0x7C) grass/rock surfing glitch (English Red/Blue))
Time Capsule exploit
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
ZZAZZ glitch party Pokémon box data shift glitch

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PRAMA Initiative a également une page sur Old man glitch.
Bulbapedia also has an article about Old man glitch.
Wild MISSINGNO. appeared!

'Missingno. glitch' redirects here, for the glitch Pokémon or 'placeholder entry', see Missingno.

The old man glitch (also known as the Missingno. glitch, although Missingno. is not the only Pokémon that can be encountered using this glitch) is a well-known derivative of the left-facing shore tile glitch in Pokémon Red and Blue, that allows one to capture high-level or glitch Pokémon, based on the player's name, as well as glitch Trainers.

It is performed by watching the old man of Viridian City's catching demonstration, using Fly to go to Cinnabar Island or Fuchsia City and then surfing on one of the following 'left-facing shore tiles':

The previous Pokémon list glitch seemingly does not exist in all the Japanese versions, or Pokémon Yellow, as the tiles east of Cinnabar Island and east of the Seafoam Islands cave apparently never give wild Pokémon.

This glitch was partially fixed in the Italian and Spanish versions of Red and Blue, as Tentacool appear if the player surfs on a left-facing shore tile. This can be worked around with by walking on the tiles; not surfing, by using the walk through walls trick (ledge method); which is a derivative of the Safari Zone exit glitch.


  1. A Red or Blue Version Pokémon game that has been played up to Cinnabar Island or Seafoam Islands.
  2. A Pokémon that knows Fly.
  3. A Pokémon that knows Surf.


1. Talk to the Old Man at Viridian City who shows you how to catch Pokémon. Say no to his question and watch his demonstration.


2. Fly to Cinnabar Island or Fuchsia City. Do not leave Viridian City before doing this.

3. If you chose Cinnabar Island, Surf along the eastern coast until you encounter a wild Pokémon. If you chose Fuchsia City, go to the shore tiles right of the east-most Seafoam Islands cave.


If using a Spanish or Italian version of Red/Blue, remember to walk across the coast using any version of the walk through walls glitch, instead of surfing on it, or you'll only get wild Tentacool.


The old man glitch is a combination of two events.

  1. In English and European versions, surfing (or walking on, if necessary) on one of the shore tiles described in the introduction of this article brings up the previous list of Pokémon in the grass.
  2. The player's name is temporarily changed to "OLD MAN" during the old man's catching demonstration, and then changed back to what it was before. In the process, the player's name is stored in memory starting from the 'grass encounter rate' memory address, at $D887. After the battle ends, the value at $D887 is changed back to normal, but what follows it (grass Pokémon and level data) starting from $D888 is not.

Saving the player's name here would normally not be a problem, due to the data being updated when you enter a new route, but it is not updated when flying to Cinnabar Island or Fuchsia City, and the first event enables the 'name data Pokémon' to be encountered.

Apparently the reason why grass list encounters appear when the grass encounter rate is 0 is because the left side of the 2x2 block ('shore') controls the type of Pokémon encountered (grass list, water list or none) with 'shore' counting as grass encounters, and the right side of the 2x2 block ('water') controls the encounter rate used (grass rate, water rate or none) with water counting as water rate encounters. Since the water encounter rate for Route 20 is not 0 and grass encounters are used, the player is free to encounter unintended Pokémon on the left-facing shore tile.

Left-facing shore tile data.png


In at least the English version of Pokémon Red and Blue, the encounters on the left-facing shore tiles work as such:

  • The second, fourth, sixth, eighth and tenth characters determine the level of a Pokémon. (the identifier of the letter is used)
  • The third, fifth, seventh, ninth and eleventh characters determine the type of Pokémon species or Trainer for values greater than 199. (the identifier of the letter is used)

The characters are case-sensitive.


The name 'Abwayax' would give a level 'b' (161) Kabutops Fossil Missingno. ('w', hex:B6), a level 'a' (160) Ghost Missingno. ('y', hex:B8), a level 'a' (161) Aerodactyl Fossil Missingno. ('x', hex:B9) and a level 80 (hex:50) 'M (00), due to 50 and 00 characters normally directly following a valid name entry name.

The identifiers of the characters can be found on the Big HEX List, as well as in the table below:

Table of selectable names:

Identifier (hex) Character Pokémon Level
00 (Null character) 'M (00) 0
50 (End of name character) Missingno. (hex:50) 80
7F (space) Missingno. (hex:7F) 127
80 A Golduck 128
81 B Hypno 129
82 C Golbat 130
83 D Mewtwo 131
84 E Snorlax 132
85 F Magikarp 133
86 G Missingno. (hex:86) 134
87 H Missingno. (hex:87) 135
88 I Muk 136
89 J Missingno. (hex:89) 137
8A K Kingler 138
8B L Cloyster 139
8C M Missingno. (hex:8C) 140
8D N Electrode 141
8E O Clefable 142
8F P Weezing 143
90 Q Persian 144
91 R Marowak 145
92 S Missingno. (hex:92) 146
93 T Haunter 147
94 U Abra 148
95 V Alakazam 149
96 W Pidgeotto 150
97 X Pidgeot 151
98 Y Starmie 152
99 Z Bulbasaur 153
9A ( Venusaur 154
9B ) Tentacruel 155
9C : Missingno. (hex:9C) 156
9D ; Goldeen 157
9E [ Seaking 158
9F ] Missingno. (hex:9F) 159
A0 a Missingno. (hex:A0) 160
A1 b Missingno. (hex:A1) 161
A2 c Missingno. (hex:A2) 162
A3 d Ponyta 163
A4 e Rapidash 164
A5 f Rattata 165
A6 g Raticate 166
A7 h Nidorino 167
A8 i Nidorina 168
A9 j Geodude 169
AA k Porygon 170
AB l Aerodactyl 171
AC m Missingno. (hex:AC) 172
AD n Magnemite 173
AE o Missingno. (hex:AE) 174
AF p Missingno. (hex:AF) 175
B0 q Charmander 176
B1 r Squirtle 177
B2 s Charmeleon 178
B3 t Wartortle 179
B4 u Charizard 180
B5 v Missingno. (hex:B5) 181
B6 w Kabutops Fossil Missingno. 182
B7 x Aerodactyl Fossil Missingno. 183
B8 y Ghost Missingno. 184
B9 z Oddish 185
C0 Ä (German version only) à Ö (hex:C0) 192
C1 Ö (German version only) ö ゥ (hex:C1) 193
C2 Ü (German version only) ゥ 4 î (hex:C2) 194
C3 ä (German version only) hûPOKé (hex:C3) 195
C4 ö (German version only) äPOKé (hex:C4) 196
C5 ü (German version only) PKMN A (hex:C5) 197
E1 PK Rival (picture/class #1) 225
E2 MN Prof. Oak 226
E3 - Chief 227
E6 ? Rocket 230
E7 ! CoolTrainer♂ 231
EF Blaine 239
F1 × (multiplication symbol) Gentleman 241
F2 . Rival (picture/class #2) 242
F3 / Rival (champion) 243
F4 , Lorelei 244
F5 Channeler 245

Default name yields

If the player's name was selected from one of the choices at the beginning of the game (e.g. RED), extra Pokémon can be encountered that wouldn't appear if they had entered the same name manually.

This is because internally extra letters appear in these names after the end (hex:50) characters. The names are actually as they appear in the table below.

Red Blue

As none of these names have a no hex:00 character in letters 3, 5, 7, 9 or 11, hex:00 ('M (00)) cannot be encountered with a default name, at least in the English versions.

The next table below shows what default names give what Pokémon.

Name Level 1 Pokémon 1 Level 2 Pokémon 2 Level 3 Pokémon 3 Level 4 Pokémon 4 Level 5 Pokémon 5
RED 132 Mewtwo 80 Golduck 146 Missingno. (hex:87) 80 Missingno. (hex:89) 128 Golbat
ASH 146 Missingno. (hex:87) 80 Missingno. (hex:89) 128 Golbat 138 Missingno. (hex:50) 141 Snorlax
JACK 128 Golbat 138 Missingno. (hex:50) 141 Snorlax 150 Missingno. (hex:7F) 141 Golduck

Extra Pokémon from the German version

Exclusively to the German version, the letters Ä (hex:C0), Ö (hex:C1), Ü (hex:C2), ä (hex:C3), ö (hex:C4) and ü (hex:C5) can be entered on the 'your name' screen, and these can be used to encounter glitch Pokémon with index numbers from 192-197, but the hex:C2 and hex:C5 glitch Pokémon (may) freeze the game on encounter.

Glitch Trainers

Since the old man glitch allows fighting trainers on the "wild encounter" code path, the enemy parameters are not properly initialized. Hence:

  • The glitch Trainers encountered through the Old man glitch always have the same rosters as Trainer class 0.
  • The roster loaded depends on the roster number of the last trainer fought.

Item duplication

See also: infinite item glitches (disambiguation).

The old man glitch is arguably the easiest and most reliable way of encountering Missingno. and 'M (00). As their invalid Pokédex flag (#000 but effectively #256) means that encountering or capturing Missingno. and 'M adds a quantity of 128 to the sixth item in the player's bag if the quantity is less than 128, it is ideal for duplicating items, such as Rare Candies and Master Balls.

Item mutation

See also: item morphing glitches (disambiguation).

The old man glitch can be used to convert the fourth item into a few other items if the player has a name that lets them encounter a Trainer, and the identifier of the fourth item is not $1X, $3X, $5X, $7X, $9X, $BX, $DX, or $FX. This requires fighting a Rocket on Silph Co.'s 11F first.

The Trainer has level 250 Pokémon, and may use a Super Glitch inducing move, so a high level Pokémon with a one-hit KO move, X Speeds and an X Accuracy is recommended as it's otherwise impossible to defeat all of their Pokémon in one hit, and after the Super Glitch effect happens, the Trainer can send out the Pokémon that just fainted.

For more information, see get glitch items using left-facing shore tile glitch.