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LGFly
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From Glitch City Laboratories

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Major glitches of the Pokémon series

Arbitrary code execution (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) | Cloning | Ditto DV manipulation | Elite Four door glitch (Japan only) | Expanded party encounter table manipulation | Generation IV item cloning glitch (Japan only) | 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) | 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) | Surf down glitch (Grass/rock Surfing glitch (Spanish/Italian only) (English)) | Time Capsule exploit | SRAM glitches (Generation II) (Mailbox glitches, Mystery Gift item corruption, Trainer House glitches) | Tweaking | 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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One TM43 is tossed to obtain 254 TM43, the index number of 'M (FE) which is written as an "8" on the screen. Next screen data is saved with "9F" and "4 8 4 8" is used to write 254 (from the "8") to CFD8, the enemy Pokémon in battle, which becomes 'M (FE) and is captured.

LGFly is a glitch technique in Pokémon Red and Blue. This glitch may not be possible in Pokémon Yellow without arbitrary code execution, due to the lack of an item functioning like 8 8 (hex:7C).

LGFly was originally introduced as a technique for 151 catch 'em all speedruns.

It is a combination of instant encounter infinite chain glitch, RAM LOL glitch and Rival LOL glitch and like Rival LOL glitch allows the player to obtain many glitch Pokémon except for those with IDs corresponding to control characters.

The glitch is one of the oldest mass farming glitches for Pokémon Red, Blue, Yellow before glitches known as oobLG, blockoobLG and text pointer manipulation mart buffer overflow glitch (or "martPWNer") were discovered and much later, banned.

Performing the glitch

Before you use this glitch, you should have a Rival name that is at least six characters long, and the second and fourth characters of your Rival's name must be hex:5E or ROCKET control character. This is to offset the location of another part of your Rival's name to the portion of the screen x=01 y=06 that affects the ID of the enemy Pokémon in battle during semi-Super Glitch techniques.

To get "ROCKET" or hex:5E in the Rival's name, you should modify item 23 and item 24's quantity in the expanded items pack to 94 because 94 is hex:5E in decimal.

What LGFly is is a combination of multiple glitches including: Trainer-Fly on Route 6, the glitch item "8 8" (hex:7C) which immediately starts a battle, and Rival LG (with tile-writing glitch item 4 8 4 8 (hex:9E) and 9F (hex:5E)) that allows you to capture any Pokémon outside of battle in an applicable Glitch City. You must also use a Rival's/Jack effect item such as RIVAL's hex:A2 to move on to a post.

Steps

First off, set-up a Trainer-Fly on Route 6. You can do this by escaping from a Trainer on Route 6, having an NPC finish walking up to you, changing boxes, resetting and then loading a Pokémon in to memory, but to do this without any Trainers you can edit the quantity of item 99 in the storage box to 1.

PC item 99's quantity controls the current script on Route 6 and is normally 0 or 256. Tossing 255 of the item allows us to change the script to have an ID of 1, which essentially sets up a Trainer-Fly on Route 6.

It is possible to set up the expanded PC items with dry underflow glitch.

The dry underflow glitch combined with the Celadon looping map trick allows us to get the glitch items "4 8 4 8" (hex:9E), "8 8" (hex:7C), 9F (hex:5E) and a Rival's item (such as Rival's hex:A2)

After setting up the Trainer-Fly, go to Saffron City and head to the south exit. There should be four posts north of the gate to Route 6. What you should do is stand three steps north of the building facing the right. Next you should use the Rival's effect item then move one step west and then one step south in that order. The Start menu should pop up.

Next, you should go to item 33 in the items pack and toss 16, then press Select on the HM03 and swap it with a Town Map. What this does is change the source of the map block data (i.e. D35F) from C6FD to 05ED but basically we end up with a Glitch City applicable for Rival LG with our current Rival name.

Now that you have LGFly set up, you can use it to catch almost any Pokémon in the game! The only Pokémon you can't catch are those that have IDs corresponding to control characters because the control characters would print a different character on to y=01 x=06.

The glitch may look a little intimidating at first because you need to follow some precise steps to catch the Pokémon you want and not freeze the game, but if you follow it step by step you can get used to it better.

Please note that due to 9F stack corruption, the glitch shouldn't be used more than about 7 or 8 times in a row per session, otherwise you risk freezing your game and corrupting your box data.

The steps once the Glitch City and Route 6 encounter are ready:

1) Use 8 8 to begin a battle.

2) Use 9F.

3) Flash the Trainer Card.

4) Modify rival name character 6 (item 25's quantity) to the Pokémon ID you want.

5) Use 9F again.

6) Press A on 4 8 4 8 but back out and don't use it.

7) Throw a Master Ball.

8) Use 8 8 again to begin another battle.

9) Run.

10) Repeat the previous steps from the start.


For battles that immediately follow captures, the foe will have glitched HP and catching it will give you a Ditto. In LGFly it's a good idea to run away from these battles.

Say you want a Mewtwo. If the quantity for rival name 6 is 253 Mewtwo's decimal ID is 131 so if we want Mewtwo we have to toss 122 from 253 to get the 131 value (or "D").

Pokémon with the glitched HP should turn into Ditto when captured instead of the original Pokémon.

Youtube videos

YouTube video by Shenanagans Smash
YouTube video by ChickasaurusGL