The best passives for Panthalus depend on the job you give it. Panthalus is Paldeck #203, a Water Pal — the sets below are the community-consensus best-in-slot for each role it can fill.

LegendDemon GodMuscleheadLord of the Sea
Legend, Demon God and Musclehead stack raw attack; Lord of the Sea adds 20% Water damage on top.
SwiftRunnerNimbleLegend
Every movement-speed passive stacks; Legend adds 15% more plus combat stats.
A perfect Panthalus also wants 100/100/100 IVs (breeding averages the parents with a bonus, so high-IV Panthalus parents compound) and 4-star condensation — feeding it spare copies raises this Water Pal's stats and every work suitability a full level. Craft-speed and attack souls from the Statue of Power stack on top. The planner routes these passives from pals you own; see how to breed Panthalus for parent combos.
Breed this Panthalus build from your save →