if you are looking for a Japanese looted treasure in the Philippines, you will most likely fail 99 times over a hundred tries.
metal detecting is allowed in PH.it needs no license to detect. But be prepared if some multitude of crowd will watch over you while you detect. metal detectors are so unusual here in the PHilippines. In fact, in the minds of the common folks, if you have a metal detector, you will surely get it. But they don't know the truth.