>>54163729By using simple in game cheat codes you can change how Pokemon data is read and when the code can't process what its reading it's done
Gen 7 GTS you can't even browse without crashing
Gen 8 for a while had 1 that crashed the stamp system after receiving it so you could never go online again because it would crash trying to receive the Pokemon first before displaying the online menu
Now the GTS is on HOME they can easily fix the crash data but because they use trash bytes as hack checks anything can still be put on