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Breeding Pathways is PalSphere's shortest-path / route calculator: start from the Pals you already own, see every reachable hatch, and get the shortest multi-generation recipe to a goal egg. PalSphere.app is the web Palworld database and tools site (not the unrelated mobile app that shares a similar name).
Quick answer
Add owned Pals, then Path to a goal for the shortest multi-step recipe, or What can I breed for every reachable egg.
Child rank ≈ floor((parentA + parentB + 1) / 2), then the game picks the closest eligible breedable Pal. Unique fusions ignore that average. Same-species-only Pals (many legendaries) only hatch from two of themselves once you own the first copy.