PkHex will have no effect on a nintendo ban BUT TPC has made a statement saying they are looking for "hacked mons", idk the criteria but I would be extra careful with whatever you're editing.
Just don't risk getting banned, stay off the internet if you plan to do not legit things or get Incognito/90DNS. If you have to ask if it's a ban risk it most likely is.
1668357803
Read the first post
It doesn't work, gives a blank item
Start a picnic with the 2 pokemon you want to breed and check the basket over time
Just hex the exp items/rare candies, first post