Poochyena will evolve into Mightyena at L18.

u dont use a stone to evolve him u nooob all u do is train him like everyone else
hahahahahaahahahahaha and u can put him in the daycare go up th the desrt and go on the
slope how u go up n down n sticky tape the up button down and then leave it over night and
wen u wake up he should be alot stronger everystep is 4exp so he goes up n down about 2
times every second have fun

u dont use a stone it evolves at lvl 16
-Colton

Poochyena evolves at L18, not L16.