>>30089867Adamant will let you outspeed those base 135 mons at +1 speed, so you can match up better against Tapu Koko or Mega Manetric once set up.
Jolly will put you 1 point above Pheromosa and all other base 150 speeds, which is great, if by the skin of your teeth.
I doubt you'll see pheromosa for much longer on simulator, so adamant is my personal way to go, with only 110 attack, it needs to hit as hard as it can.
