TC wants the "are you sure" button so that he can save hold Z and not end up buying items on accident or miss yes or no options.
Ray post is similar in the sense that if you press and hold Z in daycare you will end up picking the ultra ball, but he offered a alternate fix which was the pokeball in the first spot instead of ultra ball, but a "are you sure" button would be fitting there as well, as he also stated it. Again, read before you post. :)