>>41551779>>41551809To first describe hyper training, it requires you to have reached the battle tower facility in the game, and an item called the bottle cap. Bottle caps can be dug up by the skill brother of the digging Duo near the wild area daycare. Once your Pokemon is level 100, an NPC will be able behind the desk at the battle tower can turn a single Pokemon's stat (your choice) to act as if it were 31 at the cost of a single bottle cap. Gold bottle caps, which are much more rare, will make every stat of that Pokemon act like a IV of 31.
You can manipulate the EVS of a Pokemon, even at level 100, through a combination of vitamins and Stat reducing berries.