From Pathfinder Lost Omens Travel Guide, which isn't enabled.

Whalesteed

CREATURE 0

Variant bottlenose dolphin

Whalesteeds were first tamed in the Shackles as part of an ambush between rival pirate captains. Whalesteed riders are still an unusual sight, as learning to master the skill takes years of training.

Perception +7; echolocation 120 feet, low-light vision

Skills Athletics +6

Str +2, Dex +3, Con +2, Int -4, Wis +3, Cha +0

Aquatic Echolocation

A whalesteed can use its hearing as a precise sense at the listed range, but only underwater.

Deep Breath

A whalesteed can hold its breath for 2 hours.

AC 15; Fort +6, Ref +7, Will +5

HP 16

Speed swim 60 feet

Melee Snout +6, Damage 1d6+2 bludgeoning

Melee Jaws +6 (unarmed), Damage 1d6+2 piercing

Ramming Speed

The whalesteed Swims twice and then makes a snout Strike. As long as it moved at least 20 feet, it gains a +1 circumstance bonus to its attack roll. A Large or smaller creature hit by this attack must succeed at a DC 16 Fortitude save or be Slowed 1 for 1 round.

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