PH gives 5 Bones per player in Blox Fruits when you solo the Prehistoric Island event, based on player reports. In a squad, the Bones are split among the players who complete it.

Quick note

If you meant a different boss or event by “PH,” tell me which one and I’ll narrow it down. The most likely answer is the Prehistoric Island/Volcano event on Prehistoric Island, where the reward is shared.

Supporting details

  • Prehistoric Island’s Volcano event drops Dragon Bones for completing the raid.
  • A player report says soloing it gives 5 bones per person.

TL;DR

Solo PH = 5 Bones.