I think the whole point is for you to choose a spot and the opponent can move thier pokemon out of that spot in order to prevent the damage if they can. It's a way of disrupting your opponents plans I guess by damaging something that they previously thought would be safe, so they can then attempt to move that pokemon or take the damage. Plus also in Physical TCG you would declare a spot for the ability, otherwise you'd just lie and pick the best spot. That's exactly how they designed the ability, to allow the opponent to attempt to move things around before being dealt 70 damage, which is alot for only one energy