Effort Levels

What were once mainstays in the main series Pokémon games, EVs and IVs no longer affect stats. Instead, each stat for each Pokémon has got a specific "Effort Level", or Ganbaru Value (GV. These Effort Levels are not increased by any means other than using items that are commonly found in the game, by releasing Pokémon, catching Alpha Pokémon and more.

These items can't be used in bulk as they only work when the Effort Level is within a certain threshold.

Each Effort Level has got a specific value that feeds into the stat calculation

Effort Level 00
Effort Level 12
Effort Level 23
Effort Level 34
Effort Level 47
Effort Level 58
Effort Level 69
Effort Level 714
Effort Level 815
Effort Level 916
Effort Level 1025
HP
(round(((absolute(√(Base Stat) * EffortLevelValue) +Level) / 2.5) +round((Level/ 100.0 + 1) * Base Stat+Level))

Other Stats
(round(((absolute(√(Base Stat) * EffortLevel Value) +Level) / 2.5) + floor(NatureBonus* floor(((Level / 50.0) + 1.0) * (Base Stat) / 1.5) / 100))

However, while IVs are not utilised in the stat calculations, they can determine the starting Effort Level for a stat
IV of 0-20 gives it Effort Level 0
IV of 20-25 gives it Effort Level 1
IV of 26-30 gives it Effort Level 2
IV of 31 gives it Effort Level 3

 Effort Levels

List of Items that boost Effort Levels

Picture Name Effect
Grit Dust Mysterious dust that can raise the effort level for one of a Pokémon's stats. It can be used to raise effort levels only up to level three, however.
Grit Gravel Mysterious gravel that can raise the effort level for one of a Pokémon's stats. It can be used only if the effort level is at least level three and no greater than level five.
Grit Pebble A mysterious pebble that can raise the effort level for one of a Pokémon's stats. It can be used only if the effort level is at least level six and no greater than level eight.
Grit Rock A mysterious rock that can raise the effort level for one of a Pokémon's stats. It can be used only if the effort level has already reached level nine.