I mean, no one's stopping you from hacking in the rest of the event pokemon. Just be aware that you're putting yourself at risk if you do so.
I will only do the quest events, I don't want any risks... that's why all those question lol, I don't want to ruin my online/trading/whatever for Pokemons that not have any value other than make ur boxes looks nice lol,
but I will definitely do the Arceus event and the rest of the quest events,
btw how many "Quest Events" there in HG/SS?