like, I got this xol egg and I want to have his variant but he's still 7days. if I incubate him now, is there a change of something bad happening to it since the BSA is to hatch faster?
You can incubate your Xol as soon as you get it! Incubation doesn't do anything harmful to the egg. Just keep in mind that while incubating a new egg takes a day off its "Time until death" clock, it's still best to keep it out of click sites until it's about a day old. Freshly caught/bred eggs are more susceptible to sickness, even if they are incubated.