The video above is the Ratchet & Clank 2016 Pool Sharks Are The Worst Trophy Guide and shows how to unlock Pool Sharks Are The Worst Trophy in Ratchet and Clank 2016.
This trophy is very easy to unlock and can be obtained on Pokitaru.
When you reach the planet for the first time, in the starting area, jump in to the ocean.
Swim away from the shore and look for a fish.
The trophy unlocks the moment Ratchet dies.