Cranidos in PokeIdle: Oreburgh, Hunt 40, and an io Outlier
The io hunt level is so far from World's that I keep both numbers and I do not publish a best route.
A fossil with three addresses
Cranidos is 125 Attack and a thin defense, a glass cannon you evolve into Rampardos. On net that evolution is level 30 after you pass the Oreburgh prestige gate. On World it is level 100 after hunt 40. On io the public catalog's hunt level is 1,000, which may be an endgame mapping rather than a starter route. Until a second public source explains that 1,000, I will not tell you to walk a route.
The Rock Stone drop is why the species shows up next to evolution questions. One percent is still a catalog rate. The shop question is answered on the Rock Stone page: no fixed vendor, so the market is the practical buy. Tyranitar's catalog rate for the same stone is 0.14 percent, which is a different hunt entirely. See Tyranitar.
If you only needed the fossil for a World dex slot, hunt 40 is the number on the official species page. Pair it with how World hunts are leveled so you do not import an Oreburgh gate that World does not use.
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FAQ
Where is Cranidos on World?
Pokédex number 408, hunt level 40, about 968 XP, NPC sale 8,000, base total 350. Rampardos is level 100.
Where is it on net?
Oreburgh City at level 20, behind 300 team prestige. Rampardos is level 30.
What does it drop?
The World-side catalog lists Small Stone at 7 percent and Rock Stone at 1 percent.