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List of natural glitches in Generation I
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This article is incomplete, please feel free to add any missing information about the subject. It is missing: {{{1}}}.

This article is an incomplete list of natural glitches in Generation I. Natural glitches are glitches that do not require the exploitation of another glitch to work.

Pokémon Red, Green, Blue, Yellow

Glitch name Games Exploit/nature
2x2 block encounter glitches Pokémon Red and Blue (English, French, German) Viridian Forest no encounter grass tiles glitch: Disable encounters.
Left-facing shore tile glitch: Encounter unintended Pokémon and Trainers; old man trick; in-game trade shore encounter trick, link up shore encounter trick, fight Safari Zone Pokémon trick.
99 item stack glitch Pokémon Red and Blue (English, Japanese),
Yellow (Japanese)
Data corruption: Change badges, break an exit mat, warp.
Activating events while facing the wrong way Pokémon Red, Green, Blue, Yellow Talk to people from the wrong side, activate a PC from the wrong side, temporarily destroy objects other than the Card Key (Red, Green, Blue JP)
Amazing Man Pokémon Red and Blue Unexpected NPC sprite placement.
Articuno binoculars cry glitch Pokémon Red, Green, Blue (Japanese), German Blue Articuno cry audio distortion; make Articuno's cry sound like Nidoking.
Bicycle music hole glitch Pokémon Red and Blue Have the Bicycle music play while walking.
Bide glitch Pokémon Red, Blue, Yellow Reveal the sprite of a Pokémon that used Fly or Dig early; cause an animation error after attacking a Pokémon that used Dig with Bide damage.
Bide damage glitch Pokémon Red, Blue, Yellow
Bike Shop instant text glitch Pokémon Red and Blue Temporarily gain access to instant text until the next menu, Pokémon Center or Yes/No box.
Blaine Super Potion glitch Pokémon Red and Blue Blaine can use a Super Potion on his Pokémon even if it has full HP.
Boulder switch glitch Pokémon Yellow (Japanese) v1.0, Rev A, Rev B Having the walking Pikachu stand on any of the boulder switches in Victory Road except for the one on 1F can remove the relevant wall(s) as if the player pushed a boulder on to the switch. Fixed in "Rev 3" and the localizations.
Broken hidden items glitch Pokémon Red and Green (Japanese) Hidden items become unobtainable by the Itemfinder, or the Itemfinder detects a hidden item at the wrong place (even if it does not exist); exploit: bring a select few hidden items back by passing over a fossil.
Cable Club escape glitch Pokémon Red and Blue, Yellow (not a natural glitch in Yellow) Battle another Trainer's Pokémon outside of the Cable Club; battle a glitch Trainer roster; use another Trainer's glitch Pokémon for item duplication, item conversion or number of items expansion; use another Trainer's name for left-facing shore tile glitch yields; get the Reset button outside the Cable Club.
Cable Club Glitch City transition Pokémon Yellow See a momentary Glitch City/split Cable Club room.
Closed menu Select glitch Pokémon Red, Green, Blue (Japanese) (Japanese Red, Green, Blue): Swapping Pokémon and/or moves from on or beyond the end slot and the memory corruptions based on this (e.g. dokokashira door glitch, fossil conversion glitch); (Red/Green v1.0): Partial switch glitch.
Coastal Flooding Pokémon Red and Blue Incorrect border tile appearance.
Confusion and Substitute glitch Pokémon Red, Blue, Yellow Deal damage to another Pokémon's Substitute when a Pokémon under a Substitute hurts itself in confusion.
Counter glitches Pokémon Red, Blue, Yellow “Counter a healing item” (both the user and foe), the opponent “counter your switch”, counter a selected move which wasn't used one one side and desync a Link Battle.
Cycling Road sign glitch Pokémon Red, Blue, Yellow Cannot read a sign due to being on the wrong map.
Disappearing NPC glitch Pokémon Red, Blue, Yellow Make an NPC disappear by going to another map where they do not exist.
Dual-type damage misinformation Pokémon Red, Blue, Yellow Have the game give the wrong effectiveness message for a dual-typed Pokémon.
Empty party glitch Pokémon Red, Green, Blue (Japanese) Open the Pokémon menu with no Pokémon.
Escape sprite handling glitch Pokémon Red, Green, Blue, Yellow See the player's sprite temporarily replaced with a flipped "ABCD" square (or flipped "アイウエ" square in Japanese versions) if not playing in Super Game Boy mode after Teleport, Dig or using an Escape Rope.
Evolve without an evolutionary stone Pokémon Red and Blue Evolve Pokémon without an evolutionary stone.
Exp. All glitch Pokémon Red, Blue, Yellow An apparent discrepancy in experience gained by Pokémon with an Exp. All due to the experience being based on one Pokémon rather than all Pokémon.
Freeze top move selection glitch Pokémon Red, Blue, Yellow Use the first move automatically even if it has 0 PP, obtain 63 PP on the move with full PP Ups applied, possibly remove a PP Up. (link battle glitch)
Get stuck in a wall Pokémon Red, Blue, Yellow Become trapped in a wall and be forced to reset, have the player walk through walls when being guided, have Oak walk through the Pallet Town lady.
Ghost Bicycle glitch Pokémon Red, Blue, Yellow Prevent using the Bicycle and Surfing via a Pokémon outside of Cycling Road.
Go on Cycling Road without a Bicycle Pokémon Red, Blue, Yellow Enter Cycling Road without a Bicycle.
Go past the Marowak ghost without a Silph Scope Pokémon Red, Blue, Yellow Skip obtaining the Silph Scope in Rocket HQ (normally intended to get past the Marowak ghost).
Haze glitch Pokémon Red and Blue Cause a Pokémon thawed out from the Freeze status to still be unable to move due to a Hyper Beam recharge turn.
Hyper Beam automatic selection glitch Pokémon Red, Blue, Yellow Use Hyper Beam twice in a row, obtain 63 PP on Hyper Beam with full PP Ups, remove a PP Up.
Hyper Beam sleep move glitch Pokémon Red, Blue, Yellow Have a Pokémon that used Hyper Beam always fall asleep even if it has a status.
Infinite Blaine Door Pokémon Red, Blue, Yellow Become temporarily trapped.
Introduction Nidorino glitch Pokémon Red, Green, Blue, Yellow Unintended Pokémon cry (Nidorina instead of Nidorino).
Invisible PC Pokémon Red and Blue Access an invisible PC.
Invisible Tree Pokémon Red and Blue Have a tree reappear, but invisible.
Invulnerability glitch Pokémon Red, Blue, Yellow Avoid all damage except possibly from Swift, Transform, Bide(?).
Item jingle skip Pokémon Red, Green, Blue (Japanese, English), Yellow (Japanese) Obtain a Full Restore without the obtained sound effect, save some slight time.
Landing on an NPC Pokémon Red, Blue, Yellow Have Red appear over an NPC.
Leech Seed and Toxic stacking Pokémon Red, Blue, Yellow Have Leech Seed's damage increase every turn like Toxic.
Level up Transform glitch Pokémon Red, Blue, Yellow Temporarily gain back the original moves of a transformed Pokémon that levelled up.
Lift Key above ball glitch Pokémon Red and Blue Stand on top of the Lift Key item ball in Rocket HQ.
Magikarp salesman glitch Pokémon Red, Green, Blue (Japanese) Have 500 Pokédollars taken off you for a Magikarp but not getting the Magikarp.
Minimize and Substitute glitch Pokémon Red and Blue Cause sprites to change after viewing the status of a Pokémon after the opponent uses Minimize.
Mr. Fuji's house door glitch Pokémon Red, Blue, Yellow Be blocked when trying to leave Mr. Fuji's house door.
Mute Fuchsia City or Cerulean City Pokémon Red, Blue, Yellow Mute Fucshia City or Cerulean City.
Mute the music in the Pokémon League Pokémon Red, Blue, Yellow Mute Blue's room in the Hall of Fame.
NPC and Cable Club lady glitch Pokémon Red and Blue Have an NPC walk through the Cable Club lady and into the space behind her.
NPC binoculars glitch Pokémon Red, Blue, Yellow Prevent NPCs from moving by holding down A.
NPC moonwalk glitch Pokémon Red and Blue Have an NPC walk backwards.
Oak's Parcel prevented progress glitch Pokémon Red and Green (Japanese), Pokémon Yellow (not a natural glitch) Prevent game progress past Viridian City.
Old man full box glitch Pokémon Red, Green, Blue (Japanese) Have the old man fail to catch Weedle due to the full box message.
Partial trapping move Mirror Move link battle glitch Pokémon Red and Blue Cause Link Battle desyncronization.
Partial trapping move wrong side fainting glitch Pokémon Red and Green v1.1 Faint the user with more than 0 HP but be able to send it out again with the HP it previously had. Cause Link Battle desyncronization.
Pewter Gym skip glitch Pokémon Red and Blue Continue without the first badge; Brock Through Walls.
Pikachu desync glitch Pokémon Yellow Force Pikachu more than one step away from the player, and not directly following the player.
Pikachu off-screen glitch Pokémon Yellow Pikachu happiness corruption; Pokémon emotion forcing; map corruption; freezing the game; NPC movement manipulation; corruption of a Trainer class and roster from the overworld; sign corruption; arbitrary code execution.
Poké Mart no items sell map corruption glitch Pokémon Red, Green, Blue, Yellow (Japanese) Temporarily corrupt the tilemap of a Poké Mart.
Pokémon cloning (Generation I) Pokémon Red, Green, Blue, Yellow Obtain a copy of an existing Pokémon.
Pokémon switch message glitch Have the incorrect switch message appear, provided the foe gains more HP than it lost before the user switches Pokémon.
Pokémon Tower Pokédex glitch Pokémon Red, Blue, Yellow Register a Pokémon in the Pokédex without it appearing fully.
PP restore glitch Pokémon Red, Blue, Yellow Restore PP even when PP is at its maximum (for no effect).
Professor Oak's lab music glitch Pokémon Red and Blue Have a simplified, slower version of Professor Oak's lab music play instead of the intended music.
Professor Oak's lab tilemap corruption glitch Pokémon Red and Blue Make the player and Blue invisible, causing temporary tile columns to appear when opening the menu.
Psychic/Psywave/Night Shade animation glitch Pokémon Red, Blue, Yellow The row of the top three pixels on the screen do not shake.
Psywave desync glitch Pokémon Red, Blue, Yellow Desynchronize a Link Battle.
Recovery move glitch Pokémon Red, Blue, Yellow Have Softboiled, Recover or Rest fail.
Reflect/Light Screen stat overflow glitch Pokémon Red, Blue, Yellow Have a move freeze the game due to a Pokémon having excessive defensive stat (1024 or 1026) or deal much less damage than it is supposed to for other stats greater than 1023.
Safari Zone exit glitch Pokémon Red, Blue, Yellow Access Glitch Cities
Saffron Gym glitch Pokémon Red and Green (Japanese) Obtain the Marsh Badge by losing to Sabrina.
Save A button held glitch Pokémon Red, Green, Blue, Yellow Keep the start menu up after saving for as long as the A button is held down.
Seafoam Islands glitch text boxes Pokémon Red, Green, Blue (Japanese) Display glitch dialog, have the game reset itself, slow down menus.
See a Ghost without a Silph Scope Pokémon Red, Blue, Yellow Identify a Silph Scope ghost without the Silph Scope, but have it still act as the Silph Scope ghost.
Selfdestruct and Substitute glitch Pokémon Red, Blue, Yellow Remove a Pokémon's sprite, use Selfdestruct or Explosion but not faint.
Silph Co. 11F above lift door glitch Pokémon Red and Blue Be blocked when trying to leave the Silph Co.'s 11F.
Silph Co. PC glitch Pokémon Red and Blue Create a Glitch City in Silph Co.
Slot machine glitch A bug that prevents intended behavior for a slot machine wheel in the Celadon Game Corner to stop advancing when a 7 appears on the first wheel or a maximum of four re-rolls is reached.
Special menu Select glitch Pokémon Red, Green, Blue (Japanese) Lift glitch, badge describer glitch and the memory corruptions based on this.
SRAM glitch Pokémon Red, Blue, Yellow Start a new game with 255 Pokémon; start a new game with Pokémon from the previous save file; start a new game with Pokémon from a corrupted save file.
Stand on a tree Pokémon Red and Blue Stand on top of a cuttable tree.
Stat modification glitches Pokémon Red, Blue, Yellow Errors related to how stat bonuses and penalties work together (e.g. badge boosts, using Agility when paralyzed).
Statue behavior glitch Pokémon Red and Blue Surf and fish through statues.
Substitute drain move not missing glitch English Pokémon Red, Blue, Yellow Drain moves on a Substitute were intended to miss and miss in Japanese versions and Gold/Silver/Crystal, but due to a glitch may not miss in the English versions.
Substitute Mirror Move glitch
Substitute ¼ HP glitch Pokémon Red, Blue, Yellow Use Substitute to faint a Pokémon.
Super effective move AI flaw Pokémon Red, Blue, Yellow Have the foe locked on a non-damaging move.
Surf down glitch Pokémon Red, Blue, Yellow Surf through an impassable tile or non-water tile
Surf from a cliff Pokémon Red and Green (Japanese) Surf from raised ground, skip the Seafoam Islands boulder puzzle.
Swapping Transform moves glitch Pokémon Red and Blue Obtain “-” as the first move for CoolTrainer corruption glitches.
Swift miss glitch Pokémon Red and Green (JP) The move Swift doesn't always hit in Japanese versions.
Switch PP underflow glitch Pokémon Red, Blue, Yellow Auto select a partial trapping move, obtain 63 PP Up on a partial trapping move with full PP Ups applied, remove a PP Up.
Text errors Pokémon Red, Blue, Yellow See unintended typos, formatting errors or localization text errors e.g. an 'evolving Raichu'.
Trade evolution Time Capsule glitch Pokémon Red, Blue, Yellow (with a Generation II game) Obtain glitch moves via moves a trade evolution Pokémon learns exclusive to Generation II.
Trainer Card transition screens Pokémon Red and Blue Have a glitchy screen show momentarily before opening the Trainer Card on a regular Game Boy (DMG mode).
Trainer escape glitch Pokémon Red, Green, Blue, Yellow Disable Start and battles, encounter unintended Pokémon and Trainers, access unintended scripts.
Transform PP restore glitch Pokémon Red and Blue Have a PP restore item work as if it was restoring an original move's PP rather than the move under Transform.
Trapped in Pokémon Mansion oversight Pokémon Red, Blue, Yellow Become blocked in the Pokémon Mansion.
Trapping move and sleep glitch Pokémon Red, Blue, Yellow Make it never a Pokémon's turn while it is asleep.
Vending machine purchase glitch Pokémon Red, Green, Blue, Yellow Buy a Soda Pop or Lemonade from a vending machine with less than 300 or 350 Pokédollars but more than 199 Pokédollars.
Walk around with only fainted Pokémon Pokémon Red and Blue Receive a black out easily; enter a battle and immediately lose (if black out delayed by saving and resetting or with “il” (hex:6D)).
Walk on water through Surf Pokémon Red and Blue Stand on a water tile.
Walking Pikachu happiness glitch Pokémon Yellow Increase Pikachu's happiness quickly and easily.