Slowhax/Waithax are mainly used to install the dsiware exploit save that lets you downgrade your Native_FIRM back to a "hackable" version, and with that fully downgrade and put CFW into your system.
They can also be paired with a .CIA installer if this has implemented slowhax as their entrypoint, which allows you to install legit cias into your non-hacked console.
If you have a sky3ds i believe you can use it to set cubic ninja/TLOZ Ocarina Of Time to get homebrew going, and then spend a little bit less than 10$ on a DSiware game and downgrade with that.
However the games have been pulled, and i'm not sure how the injection of sudoku into dsiware's work.
EDIT: This only applies if you're on 11.0 -11.1 though.
The pokemon games require 11.0 to boot, and if you say you don't want to update that means you must be on 10.7 or below.
If that's the case, follow this guide and you'll have a protected cfw'd 3ds and another separate sd card you can use to store games.
www.3ds.guide