IV Stone pickup question

On the wiki it says that IV stones have a 1% chance of appearing from pick-up if the pokemon is level 71-90, and I currently have a team of level 91+ Ambipoms that I put together for farming PP Ups. Do IV Stones function similarly to PP UPs where they go from 1% at 71-90 to 4% at 91+, or do they ONLY appear from pickup at 71-90?

They only appear from pickup at 71-90, Insurgence uses the B2/W2 Pickup table with Prism Scale at level 71-90 replaced by IV Stones, 91+ won’t give you IV stones, you get’d leftovers and prism scale.

Awesome thanks for the clear answer. Looks like I’ll just need to make another pickup team