This giant shark partols all the way around the Timeless Isle including into fatigue waters. He does not stop moving when engaged, although he puts out some portals (white - purple ones stun) that will allow you to cast while swimming. He does no damage as long as you stay to his sides or back (in front of him will one-shot anyone), so it's really a matter of having the patience to chase him while DPSing long enough to kill him.
He drops Mist-Filled Spirit Lantern which you can use to summon the rare boss Dread Ship Vazuvius.
As a note: I don't remember if it was part of a patch or hotfix, but the gravestone (where you use the lantern) and Evermaw no longer share a spawn timer - i.e. if you saw Evermaw, you knew the gravestone was "active"; and if you saw that the gravestone was active, then you knew Evermaw had spawned.
I've had instances where the duration on the lantern ran out long before the gravestone became active. (╯°□°）╯︵ ┻━┻
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