The best way is battling the Elite Four.
drifloon
It is 66 deg 15 min 0 sec.
In the grass north of Oreburgh town.
66 minutes
4:20 at Route 66
In the 60's, watch out for her Garchomp who is Level 66.
he learns it at level 66
Try unplugging it for one min an plug back in. That should reset it.
There are 5 people, 4 having 5 Pokemon and 1 having 6. The levels of the Pokemon they have range from 51-66. most of the Pokemon are level 51-56.
Machop is #66 in the national pokedex, and it is a Fighting type Pokemon.
metang evolves at lv 66 you might be lucky to get one at lv 65
You find Drifloon at Valley Windworks on a Friday afternoon and you see Drifblim when you battle Fantina the 5th gym leader who specializes in Ghost Pokemon