Download Luma3DS 9.0 - Plugin loader and CTRPluginFramework - Action Replay (Included in this repository or you can download from here)
Make sure you already installed the latest Boot9strap and Luma CFW and have a firmware of 11.4 or higher.
Replace the boot.firm from the root of your SD Card with the Luma3DS 9.0 - Plugin loader.7z boot.firm
Place the contents from CTRPluginFramework - Action Replay.7z into SD:/luma/plugins/<Title ID of the game folder>/
Either download or clone this repository or search in the cheats folder for the game you want to cheat on and download the .txt file in the folder
Move the .txt file to either sd:/cheats/ (txt files are conviently already named correctly if placing here)
Or place in same folder as the plugin.plg from #4 and rename the .txt to cheats.txt
Use your button combo to load up rosalina menu (default is usually L+Down+select) and enable plugin loader and then load up your game (if you get a green screen during load then it worked) and cheat to your hearts content!
To open CTRPluginFramework menu press select once in game

Using BOOTNTR

(If not using/running with LUMAS3DS 9.0 Plugin Loader)

If you decide to want to use LUMAS3DS 9.0 Plugin Loader alongside with BOOTNTR follow from the first step otherwise start at the third step!

Make sure That Disable the Plugin Loader from the Rosalina Menu if Your using the boot.firm of Luma3DS 9.0 Plugin Loader.
Only BOOTNTR 3.3 Works if Your using the boot.firm of Luma3DS 9.0 Plugin Loader.
Download CTRPluginFramework - Action Replay (Included in this repository or you can download from here)
Make sure you already installed the latest Boot9strap and Luma CFW and have a firmware of 11.4 or higher.
Place the contents from CTRPluginFramework - Action Replay.7z into SD:/plugin/<Title ID of the game folder>/
Either download or clone this repository or search in the cheats folder for the game you want to cheat on and download the .txt file in the folder
Move the .txt file to either sd:/cheats/ (txt files are conviently already named correctly if placing here)
Or place in same folder as the plugin.plg from #5 and rename the .txt to cheats.txt
Open up BOOTNTR and wait for it to do it's thing
Load up game (if you get a green screen during load then it worked) and cheat to your hearts content!
To open CTRPluginFramework menu press select once in game

If you wish to contribute

codes that the CTRPF AR supports(Same as Gateshark but with more options!): link

Create an issue!
If creating an issue for a broken cheat, it may take time for me to test and see if I can fix (if I can fix at all).
I can't test every single cheat in this repository! Sorry :/

Put them inside a text file called cheats.txt or <Title ID of the game>.txt.

Put them in SD/plugin/<Title ID of the game folder>/cheats.txt
If your using the Luma Plugin Loader, Put them in SD/luma/plugins/<title ID of the game folder>/cheats.txt
Or put them in SD/cheats/<Title ID of the game>.txt

Can I use both cheats.txt and <Title ID of the game>.txt files at the same time?

No, you don't/shouldn't use both if you already have 1 .txt file for the game in one of the directories. You only need either a cheats.txt or <Title ID of the game>.txt for a game not both.

LUMA3DS 9.0 Plugin Loader only recognises CTRPF (AR) Plugins called plugin.plg
Make sure your using only 1 CTRPF (AR) Plugin! And No Other Plugins included alongside it! (Such as Gateshark2NTR, libshark2NTR or any other Plugins).
If it gives you error,Try Deleting the CTRPFData.bin if it exists.
To turn off LUMA3DS 9.0 Plugin Loader restart your 3DS and don't enable the plugin loader again unless you need to.
NOTE: Games - Inazuma Eleven 3 (EUR), Teenage Mutant Ninja Turtles (USA) and (EUR), Shovel Knight (EUR) and (USA), LBX - Little Battlers eXperience (EUR) have 2 different .txt files. I Need to look into this.
If you can't find a game you are looking for, you can try Max Cheats and see if they possibly have it.