How to run homebrew
http://www.3dbrew.org/wiki/Homebrew_Exploits

>How to hack your 3DS
http://3ds.guide

>How to use injectors
The most straightforward way is to use a homebrew save dumping tool like JKSM, and use PKHeX to edit the file itself.

>In-game injects and no-outlines mod
https://github.com/SciresM/SMPatcher/releases
Pre-patched codebins:https://mega.nz/#!nQUDwZQJ!LYEszSk-7_Fx7srnSU9PGQjoSjZT2SflRhMyAEsxj4k

>Luma
Just copy and paste one of the patched code.bins into SD:/luma/code_sections

Hold select when booting Luma to open up the config menu, turn on "Enable region/language emu. and ext. .code" and press start.

>HBL (New 3DS only, otherwise use Luma)
Extract the patched code.bins and rename them to 00175E00.code for Moon and 00164800.code for Sun.
Place it in SD:/hans/

Start up the homebrew menu and open HANS, open Pokemon through it. Finally, use the in-game QR scanner, and you're golden.

>OLD guide on injection
http://pastebin.com/SYAcZLNQ (embed)
http://pastebin.com/FWSxVMue (embed)

>For ROM-hacking stuff
http://pastebin.com/zmH9KsGd (embed)

REMEMBER TO BACKUP YOUR SAVES BEFORE INJECTING OR SAVE EDITING.

>If you want an injection, follow this guide for how to request-- or don't post at all. Only ask for Sun and Moon

RULES (read!): http://pastebin.com/GFZKHhaE (embed)
Pkhex: http://pastebin.com/1CgssPrV (embed)

>QR Code Guide
http://pastebin.com/sTHDtrDS (embed)
>Recommended shitmons to use: Paras, Goldeen, Morelull, Cosmoem, Misdreavus. Alternatively, Stone Eeveelutions in the mid-teens or in the 40s. You can buy Fire, Water, and Thunder Stones in KoniKoni City

>Ready-made legal templates: https://mega.nz/#!LgYTjDQT!jD39cgcHmo9sfeAApao3GIBoPrjHI3aZv2AAe4vxIzQ
Credits: Basketcase friend!

>Soundhax is now available for both o3ds and n3ds
https://gbatemp.net/threads/how-to-use-soundhax.454760/

No Mega Stones, no bumps and for our sake, no Trade Evolutions on the GTS.