I may not have permission to do this but I really don't want to lose this amazing guide, if ShadowHunter makes a new thread and posts that guide there I'll remove this topic, if someone doesn't want me to post this thread anyway, I'll remove it.
Guide originally written by ShadowHunter, all credit goes to him. ShadowHunter

I recently wandered into 3rd Gen RNG, it seems that LG/FR RnG is not as known and I just want to compile all the information I gathered.

Introduction: Why RNG 3rd Gen?

Though Game Freak Introduced Plat/HG/SS to pushed out the reliance of 3rd Gen games, but some features and pokemon are exclusive to the 3rd Generation.



Notable Exclusive moves: Detailed Version here
Mew: Softboiled, Hypnosis, Fake out
Mewtwo: Selfdestruct, Mega Kick, Counter
Deoxys: Counter
Regi-Trio: Sesmic Toss
The most important thing is that, shiny Mew and Deoxys can only be obtained in 3rd Generation games.

Prerequisites:


1) Download VisualBoyAdvance 1.0.8.3 or VBA-M, Google it up, Set the settings to the following to maximize speed

• Select No throttle (Under Options --> Frame Skip)
• Select Priority: Highest (Under Options --> Priority)
• Select Speed up Toggle (Under Options --> Emulator)
• Select Filters to normal and turn off sound

2) A Reliable computer

If you can't get over 600% speed in VBA, do not attempt because this projects can take weeks to accomplish with a slow computer.

3) Download the OLD PokeRNG (Wichu has it) Link

This checks the your current frame. We will only be using "Method 1" "Seed 0".

4) Shiny Bit XoR Calculator MegaUpload Link

This checks if the ID/SID combination produces near flawless shiny spreads

5) Download RSEdecode aka RSE.exe Link

• This checks the IV of the pokemon you captured.
• Visual Instructions on Youtube

6) Download RNGreporter (Mingot's Sig)

• Not mandatory, but it can check fram & shininess (but it is slow when it scans above 100 million frames)

Choosing The Perfect or Ideal Spread:

1) How to get a desired ID/SID combination.
It is not possible to RNG a specific ID/SID at the moment, you just have to test your luck.
You chance of landing on a particular spread is exactly 1 in 8192.
There are 67 perfect spreads, so chances of landing on a perfect spread is 57/8192 (some ID/SID contains 2 perfect spreads)
However, there are over 3000 30 IV+ spread, and over 11,000 29 IV+ spread.
This means, you are bound to get a "somewhat decent" shiny spread within couple tries, and a "decent" spread within many tries.




All Method 1 Perfect IV PIDs,
Don't worry I have this in the BitXor Calculator



Trainer ID and Secret ID Creation:



The 2 screenshots show when Trainer ID and Secret ID are created.
We will be abusing ID / SID generation with VBA save states. (File --> Save File)
Make a save state at the Name setup screen if you want to SR for a ID.
To control the SID generation, you have to make a save state 1 dialog before this because there is nothing to press for this one.
What you can do is, lock in just make a save state 1 dialog before the 2nd Picture to just SR the SID.


2) Checking your ID, SID, there are 3 methods:

• AR Code
• RSEdecode Youtube Link
• Pal Park

AR Code I noticed that the ones that check Trainer ID Card gives the incorrect SID.
RSEdecode you have to pick up your first pkm for this to work, but it is 100% accurate
Pal Park is just extremely long as you have to go through the requirements of Pal Park, At least 6 pkm in your PC, and positioned in a PkmCenter etc. etc. etc.

3) Matching your ID, Secret ID to useful spreads.

There are basically a chain of bit XoR calculation, Deducing your secret ID, however
I made an excel file (Requires MS Office 2007 & Macros enabled) that does all that work for you and populates any decent shiny spreads.
If you have office 2003 or disabled macro this will NOT work

Bit XoR Calculator MegaUpload Link
Features:
1) Check for any useful shiny useful IV spreads with a given ID/SID Combination.
The spreads already listed can be customized and are not limited to the listed spreads.
2) 3rd Gen Shiny Egg Finder, by archiving all ID/SID entered, can quickly determine if you already have a save file where an Egg can possibly be hatched shiny.
3) Calculator for calculating frames to either real time or game time.
4) Binary Calculator, XoR Calculator, Hex-to-Binary, Dec-to-Binary Calculator. You don't need any of these because I wrote the code in Visual Basic to calculate everything.
5) An Emerald focused Shiny Spread Table, where it searches for more flawed spreads in lower frames. *Coming Soon*
In Emerald, some spreads are possible but not plausible to achieve, this spread table enables the user to choose their maximum frame and searches for the highest spreads within the parameter.



Just enter the ID and Secret ID under Column B & C respectively, then go Menu (Top Left) and press "Update Method 1 Shiny Search"
A number will be automatically generated in column A, this number is for personal archive purposes.
If for any reason you want to change any elements on the spreadsheet, you should use the "Rerun" button as it will do a complete scan instead of updating missing ones.
If nothing shows up in Column E & F, then it means that particular spread has no decent spreads. Then go back create another ID/SID combination.

If you got a decent spread(s) from the ID/SID combination, save the spread both the excel file and the VBA sav.

Go (or Warp) to the necessary legend. (Must be a Legend or a Method 1 Pokemon)
1) Save in front of the legend. (Actual .sav file)
Note down the In-Game save time
2) Create another Save State.
3) Catch the Pokemon (Masterball is fine)
4) Open up RSEdecode

Using RSEdecode Youtube Tutorial Link
RSEdecode is to check the IV and the PID of the pokemon, which is important.
1) Put the desired PKM to check for its IV in the 2nd Slot
2) Create a folder in C drive and call it rsedecode
3) Click Tool --> Memory Viewer, Click 32 Bit and Click Go on top right
4) Click save, you will see a pop-up

5) For Address, it is different depending on the game:

Emerald

Party Slot 1 - 20244EC
Party Slot 2 - 2024550
Party Slot 3 - 20245B4
Party Slot 4 - 2024618
Party Slot 5 - 202467C
Party Slot 6 - 20246E0

Ruby/Sapphire

Party Slot 1 - 3004360
Party Slot 2 - 30043C4
Party Slot 3 - 3004428
Party Slot 4 - 300448C
Party Slot 5 - 30044F0
Party Slot 6 - 3004554

Fire Red/Leaf Green

Party Slot 1 - 2024284
Party Slot 2 - 20242E8
Party Slot 3 - 202434C
Party Slot 4 - 20243B0
Party Slot 5 - 2024414
Party Slot 6 - 2024478

Size: 64, then click Save in rsedecode
6) Save as monster.dmp in C:/rsedecode
7) Press Start --> Run --> CMD, type cd \rsedecode, follow by typing "rse".

This will give you the IV of the pokemon, now plug the data into PokeRNG

Using PokeRNG

All Legends are generated via method 1 seed 0.
1) Enter 1 for Method 1
2) Enter Nature Make sure NATURE IS CAPITALIZED
3) Enter 0 for Not shiny
4) Enter 0 for Hidden Power
5) Enter 1 Make sure you are looking for exact IVs
6) Enter in the IVs
7) Then hit 0 for ave IV, 0 delay, 0 start, 0 end

The resulted generated are contained a text file (spreads.txt) and a csv file where you saved the PokeRNG.exe. (the csv file doesn't get updated all the time).
All you need to do is look for the frame of the pokemon you caught.

If the Frame that you caught the pokemon on is within 150 million frames away, you may consider using it. What it means is that you will let the emulator run for X amount of hours to advance 150 million frames.
If it is significantly higher than 150 million, go back to step 1 under "Go (or Warp) to the necessary legend".

Note that 60 frames advances per second, while using VBA 10x speed can advance up to 600 frames per second. You need to basically let the VBA "Sit" to advance to your target frame.

This is an example
Quote:
Results:
4130910329F 7481697c (NAUGHTY, ability 0) 8/19/15/14/10/27 (Seed: 00000000 Frame: 4130910329) HP GROUND 69
Target Frame 4197705711 - Actual Frame 4130910329 =~ 66 million frames
By Plugging into my integrated function on my BitXoR Calculator
I yield 309h 14m 16s.

Earlier I have noted down the In-game save time.
Say if I saved right in front of Mewtwo @ exactly 10h 00m, you will hit the frame approximately at 319h 14m
So one way to keep track of time is Previous Game Time + Time for Frame Advance = Target Time*

*If you need to advance more than 999 hours, obviously this will not work as the clock's limit is 999 hours

It takes VBA approximately 24-48 hour to advance depending on how fast your computer runs.
The slower your computer runs VBA, the longer it takes to reach your target frame. The difference is not in minutes, but in days.

Time Reference:

You can tell that advancing millions of frames can take a while, and the speed of VBA is crucial the frame number increases.


Refining to the actual frame:

1) Make frequent saves and make sure you name files differently.
If you go over and accidentally overwritten your only file, you lost everything and back to step 1.
Probably save once every couple hours, and every hour when it is getting close, power surge, frozen comp, anything can happen.
2) Use RSEdecode + PokeRNG to check where you are, repeat those 2 steps again
Just create a save state, catch the pokemon, upload to RSE and execute, then plug IV to PokeRNG to get your frame, then continue your save state.
3) With the in-game clock method, you should hit the approximate frame within the minute.
If you cannot use the in-game clock method, you can approximate with the "frame to realtime calculator" in BitXoR calc app
4) Once you are within 0-500 frames, you need precise measurements
- a) PAUSE the game (Control + P)
- b) Load up the game, at normal speed (100%)
- c) Press Unpause (Control + P) and A to engage the legend immediately
Find out the exact frame, then reload the game state.
- d) Press "Next Frame" (Control + N)
This will fine tune to the exact frame, as hitting "Next Frame" advances 1 frame.
Hit it as many times as you need to hit your target frame, but it is wise to make a save state about 10 frames away from target just incase.
- e) When you are on your target frame, unpause and quickly engage

You should hit your shiny pokemon now.
If you didn't, here are the possible reasons
You had the wrong secret ID (RSE decode is 100% accurate, some AR codes aren't)
You were a few frames off.
You didn't read this guide carefully.






Happy 3rd Gen Shiny Hunting, Good Luck!

FAQ:
Can you teach me?
If you have any questions, you are free to PM me.
If you have never RNG'd before, please do not attempt. Try Emerald RNG or 4th Gen RNG first
How to get a Shiny Mew?
It can be done on Emerald, however, the Old Sea Map was never given out outside of Japan, so legit in-game mews can only be Japanese.
Can I do this via an actual cartridge?
(Short answer) No, this is for emulator / ROM only
(Long answer) This is extremely hard (close to impossible) to do with an actual cartridge,
You can use gameshark to write a save state, transfer it to a VBA and continue with the routine.
Can I use this guide to RNG method 1 from Emerald / Ruby / Sapphire?
You can take this concept and use it on Emerald, use that Emerald always start on Frame 0, which has its pros and cons.
I believe Ruby / Sapphire PRNG structure would take asimilar approach, I am not exactly sure.
So you can get these Pokemons on VBA Emulator, how do you transfer it to the Real game?
There are couple ways, the easiest is to use Desmume Emulator, which means that you need an 4th Gen ROM.
The second way is to convert the save file to use EZ Flash 3-in-1 to do a Pal Park
The last way, is to have 2 GBA, a Link cable and a memory card, transfer it to an actual cartridge.

Buggery Questions, Please don't PM me questions like:
"What pokemons are you working on?" or "Can I have a Selfdestruct Mewtwo?"
No, I no longer expose my projects
"Can you get me a [Insert Shiny Pokemon]?"
No, the guide is here, do it yourself
if you read the complete guide (which probably you haven't), it takes days upon days for a project.
I can't guarantee I can hit that specific flawless spread within hours, or if I ever will get that spread.Emerald projects, can take months like I said, many are possible but not plausible as it requires you to idle in VBA 1000-3000 hours.
Other Readings:
Bozo's Shiny Egg Guide PID Hex to Binary
RNG manipulation in FR/LG

Hatching shiny flawless eggs in Emerald
Credits goes to Mingot, Stingray_Spin, Bozo, ShadowHunter.

Warning: this guide assumes you've read and understood ShadowHunter's guide.


In order to get flawless IVs you need at least one poke (that will be the parent) with the IVs you want. You may even use a parent with only 3 flawless IVs and look for the correct inheritance with RNG reporter.

There are 3 methods for IV prediction when breeding in Emerald:

- Splits
- No Splits
- Alternate

If you try to predict the IVs of an egg with the wrong method, you’ll get the wrong IVs because of different inheritance and frames, so you have to find your method by checking IVs of random eggs and see which method gives you the correct results in terms of frames and inheritance, in RNG reporter. You should also know that only female parents can pass their nature when holding the everstone, unlike in 5th gen games.

Once you’ve found your breeding method you might want to look for low frames with perfect IVs, for example frame 15563 for Alternate breeding, which requires 3 flawless IVs on one parent.

When the daycare man holds an egg, its PID is already set, so even if you save and soft-reset the game you’ll get the same nature, gender, ability etc. but the frame counter will reset to 0, so you can reach low frames with the IVs you want pretty easily.

I’ll show you how to breed a flawless shiny poke with an example.
I gave my hexflawless female impish duskull @ everstone (so it’s parent A) and my male koffing to the daycare woman because frame 15563 says it will get IVs from parent A.

I run with the bike outside where the old man is until I see him making a step forward, which means he has an egg ready, and make a save state (es: shift+F2) when I’m close to him.

I grab the egg, hatch it and look at its nature and trait, if they’re not the ones I want I reload the save state (F2), discard the egg and try with another egg; if they are correct I export the hatched poke’s info and read them with Mingot’s RSE decoder so I can copy its PID and paste it in ShadowHunter’s excel file (egg tab) in order to see if I get a shiny match with one of my save file’s ID/SID combination.


The more save files you have, the easier it is to find a match, if the PID doesn’t match I repeat the process until I find one that matches and make sure I reload the correct save state, run with the bike again and make a new save state each time before I collect a new egg.



Once I find a shiny match, excel will tell me which save file the egg will hatch shiny on, so I reload the last save state and save in front of the old man because I want to reset the game in order to reach frame 15563.

If you open emloop and put the target frame in the upper-left box and generate its correspondent time, you’ll notice that it would take approximately 4 minutes at 100% speed to reach it, but you can even make VBA run faster with speed toggle, thus reducing the amount of time needed to reach the frame.


I start emloop and soft-reset the game, then get to the point when the old man tells you “take care of it” and wait for the timer to reach 0, as soon as it does I make a new save state.


In order to check which frame I’m on in that save state I pause the emulator (ctrl+P), reload that save state, do 1 frame advancement (ctrl+N once), hold A and unpause (ctrl+P again to unpause) to collect the egg.
I can now check its ivs with RSE decoder and plug them into RNG reporter to find the frame I’m on (15555 in my case, so I want to pause, load the last save state, advance with ctrl+N 9 times [nine because it’s 8 plus the one advancement we did earlier) hold A and unpause.

If everything is correct I have my flawless egg which needs to be hatched in the correct save file, it’s possible to trade eggs between two emulators with VBA link, for example.




Which Pokemon should be RNG'd in 3rd gen?

The following pokemon will get exclusive tutor moves in Emerald and/or XD Gale of Darkness.

- Seismic Toss, Counter
- Counter
- Seismic Toss, Dynamicpunch, Counter
- Body Slam, Selfdestruct(XD)
- Swords Dance
- Double-Edge, Counter, Selfdestruct(XD) [Munchlax can get it in 5th gen now though]
- Body Slam
- Body Slam, Dynamicpunch
- Seismic Toss, Counter, Softboiled
- Selfdestruct(XD), Mega Kick, Counter, Dynamicpunch
* - Softboiled, Hypnosis, Fake out
* - Counter
- Sesmic Toss, Body Slam, Counter
- Level 45 [Ruby and Sapphire only]
- Softboiled, Body Slam [But you would lose Nasty Plot]
- Body Slam, Dynamicpunch [But you would lose Close Combat]
- Double-edge, Counter [But you would lose Brave Bird]

*only shiny in 3rd gen.

Offensive

-Abomasnow
-Aerodactyl
-Alakazam
-Ambipom
-Arcanine
-Azelf
-Azumarill
-Bisharp
-Celebi
-Chandelure
-Charizard
-Cobalion
-Crobat
-Darmanitan
-Donphan
-Dugtrio
-Durant
-Eelektross
-Electivire
-Emboar
-Escavalier
-Flygon
-Froslass
-Gallade
-Galvantula
-Golurk
-Gorebyss
-Heracross
-Honchkrow
-Houndoom
-Huntail
-Jolteon
-Kingdra
-Krookodile
-Lilligant
-Machamp
-Mamoswine
-Medicham
-Mew
-Mismagius
-Moltres
-Nidoking
-Ninjask
-Porygon-Z
-Raikou
-Rhyperior
-Rotom-C
-Rotom-H
-Rotom-F
-Sawsbuck
-Sceptile
-Scolipede
-Scyther
-Sharpedo
-Shaymin
-Sigilyph
-Smeargle
-Snorlax
-Stoutland
-Suicune
-Togekiss
-Tornadus
-Venomoth
-Victini
-Weavile
-Yanmega
-Zoroark

Defensive

-Altaria
-Blastoise
-Chansey
-Claydol
-Clefable
-Cresselia
-Deoxys-D
-Donphan
-Drapion
-Dusclops
-Dusknoir
-Empoleon
-Ferroseed
-Gligar
-Hippowdon
-Hitmontop
-Milotic
-Nidoqueen
-Porygon2
-Quagsire
-Registeel
-Roserade
-Rotom
-Slowbro
-Spiritomb
-Tangrowth
-Umbreon
-Uxie
-Walrein
-Weezing
-Whimsicott
-Xatu
-Zapdos