Serious Hacking is very difficult. Entering coding is no easy feat.
Anyways, if you need to, serious equipment can be found in certain locations. (50-1200 bucks.)
If you want safe Pokemon, use PokeGen. AR will break the game.
Aaaaaand, you need to be taught. Another 100 dollars.
People typically hack for knowledge, you can check of a couple of my threads to see my posts.
It can break your cartridge. But I have no knowledge of it breaking a DS alone.