MAX SPEED HIDDEN POWER FIRE POKEMON WITH HYPER TRAINING IN POKEMON SUN AND MOON!
In order to get a Fire Type Hidden Power, you need to have the value of the sum be 8. This requires an Attack IV divisible by 4 plus 2, (2, 6, 10, 14, 18, 22, 26, 30), and a Defense IV divisible exactly by 4.