You don't need to use any stone on Pidgeotto. It evolves by level up, at level 36.
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it does not use a stone to evolve but you can levell it up to 36 and it will evolve
Pidgeotto evolves starting at Level 36. At Level 18 , Pidgey evolves into a Pidgeotto and at level 36 Pidgeotto evolves into a Pidgeot.
Train Pidgeotto to Lv 36.
pidgeotto will evolve at level 36
Pidgey evolves into pidgeotto somewhere along the 20's and pidgeotto's evolve at some level in the 30's.