You can't until you trade it in after you beat the Elite Four and the Sevvii Islands sidequest
level it up to level 20.
lvl 20
The Hoothoot evolves into the Noctowl at level 20. The Noctowl doesn't evolve any further
Check if it is holding an everstone.
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Both! Noctowl appear in the grass and Hoothoot appear by headbutt.
Hoothoot evolves into Noctowl.
he evolve into noctowl
Hoothoot evolves at level 20.
At Level 20 Hoothoot evolves into Noctowl.
Hoothoot evolves into Noctowl at level 20.
Hoothoot evolves at level 20 into noctowl
hoothoot evolves into noctowl at level 25
Hoothoot evolves into Noctowl at level 20.
noctowl
hoothoot evolves into noctowl at level 20
Hoothoot evolves at level 20 in to Nocowl.
train it