BASE64 writer 3.0 setup (by Mettrich)

Game:

Instructions — click me first!

How to Spawn Pokémon with the custom ACE Pokémon builder tool (using a Base64 writer)

The custom ACE Pokémon builder tool will allow you to create any Pokémon with any data and spawn it inside your Pokémon game using the Base64 codes provided after clicking the Generate button. This feature is most useful for console users, as there are easier ways to copy Pokémon data on a computer with an emulator, such as copying the Hex data and pasting it into Pokeglitzer.

When generating a Pokémon with the tool, you will see 14 box codes. Typing these 14 box codes into your PC and executing it with any stable ace species and the BASE64 writer will spawn that exact Pokémon into your PC, box 14 slot 30. Here is how you create the BASE64 writer:

Creating the BASE64 writer

Make sure of the following before getting started:

You have created a stable or metastable ace species using the Dots egg. (Stable ARM species 0x410e recommended on western language versions. Japanese versions not yet supported for this guide!).
Boxes 11–14 are empty.
Box 10 slot 22 is empty.

You may now select Console/mGBA or Old Emulator below and start typing the first code. Any Nintendo console with a real cartridge or mGBA emulator version 0.9 or newer is considered "Console", and most other emulators are considered "Old Emulator".

How to Spawn Pokémon with the custom ACE Pokémon builder tool (using a Base64 writer)

When generating a Pokémon with the tool, you will see 14 box codes. Typing these 14 box codes into your PC and executing it with your ace species and the BASE64 writer will spawn that exact Pokémon into your PC, box 14 slot 30. Here is how you create the BASE64 writer:

Creating the BASE64 writer

Make sure of the following before getting started:

You have created an ace species and placed it inside box 13, ready for the grab ACE execution method (ARM species 0x0351 recommended on western language versions, japanese not yet supported for this guide!).
Boxes 13–14 are empty, except your ace species in box 13 and a random pokemon to swap with to execute the codes
Box 10 slot 22 is empty.

How to Spawn Pokémon with the custom ACE Pokémon builder tool (using a Base64 writer)

Creating the BASE64 writer

Make sure of the following before getting started:

You have created an ace species and placed it inside box 13, ready for the grab ACE execution method (ARM species 0x0351 recommended on western language versions (the first one you make with mail glitch), japanese not yet supported for this guide!).
Boxes 13–14 are empty, except your ace species in box 13 and a random pokemon to swap with to execute the codes
Box 10 slot 22 is empty.

You may now start typing the first code.

Box  1:    B C U n _ F J u
Box  2:    I k o B 3 h F
Box  3:    A A T . h r
Box  4:    A h _ f n
Box  5:    _ F Z O T . h r
Box  6:    J J J _ 1 / …
Box  7:    P q / _ … n
Box  8:    v 6 5 Q K
Box  9:    T . g L _ F Z O
Box 10:    R j o D Y J m ?
Box 11:    B n F K T F F F
Box 12:    U U F R R G O U
Box 13:    T H S G Q U R L
Box 14:    Q T R R U U F F

upper case O (O)

One (1)

lowercase Q (q)

upper case O (O)

Save the game
Execute the code with your stable ace species with no trailing spaces. If you are using a stable or metastable THUMB species, you NEED a THUMB -> ARM bootstrap bad egg anywhere from box 12 slot 4.
Check the bad egg in box 10, slot 22. It should be in a Great Ball.

Box 8:    v I 5 Q K
Box 11:    B n R G J I F F
Box 12:    H G G T M N F G
Box 13:    I I T T H T F T
Box 14:    S R Q Q I T F G

Skipping boxes 9 and 10!

Codes in boxes 1-7 + 9-10 will be same as before

Save the game
Execute the code with your stable ace species with no trailing spaces.
After executing this code, no visible change will happen to the egg. Keep going with code 3!

Box  8:    v X 5 Q K
Box 11:    B n S K N L H F
Box 12:    J T I L G H S J
Box 13:    Q U F G Q U G O
Box 14:    F L I G F N H O

Skipping boxes 9 and 10!

upper case O (O)

Codes in boxes 1-7 + 9-10 will be same as before

Save the game
Execute the code with your stable ace species with no trailing spaces.
After executing this code, no visible change will happen to the egg. Keep going with code 4!

Box  8:    v m 5 Q K
Box 11:    B n F J S Q F N
Box 12:    I O I T F F R T
Box 13:    J F G L M F F G
Box 14:    I H T Q T M

Skipping boxes 9 and 10!

upper case O (O)

Codes in boxes 1-7 + 9-10 will be same as before

Save the game
Execute the code with your stable ace species with no trailing spaces.
After executing this code, the Bad Egg in box 10 should now be in a Nest Ball.

Box  8:    v ♀ 5 Q K
Box 11:    B n F F S F Q K
Box 12:    H I P H I L P I
Box 13:    F H T F G R U U
Box 14:    H U T G

Skipping boxes 9 and 10!

Codes in boxes 1-7 + 9-10 will be same as before

Save the game
Execute the code with your stable ace species with no trailing spaces.
After executing this code, the Bad Egg in box 10 should now have become WELDR, the BASE64 writer! (Don't open its summary, you will crash)
Move WELDR to box 14 slot 28
Catch any Pokemon and name it "J-FKVC"
Place this in box 14 slot 29.
DONE!
Now type and execute the following test code to make sure WELDR is correctly generated:
box 1: [AQD?Pw__] (two spaces at the end). It should generate a Bulbasaur in box 14 slot 30.
You are now ready to use BASE64 codes! Go back to the ACE builder tool and have fun! To spawn any Pokémon, type in any Base64 code made from my website, and execute ACE. The Pokémon will appear in box 14 slot 30, so make sure to keep that slot empty for spawning Pokémon. If you want to spawn another Pokémon, simply replace the code in the PC with the new code and execute again, no need to redo the whole setup!

IMPORTANT: If you want to execute regular codes in the future, make sure to move WELDR and the sacrificial Pokemon out of box 14 first!