May contain spoilers
Absol is one of the most well known psuedo-legendary pokemon, and likely the first one the player will obtain ingame.The player encounters one on Route 10, which seemingly likes the player; though when Tess and Jake walk through the route connector it gets startled and runs off. The player also meets the same Absol when preparing to battle Professor Cypress- this time, though, it joins the player's party. It holds a Mega Stone, allowing it to Mega Evolve during battle as long as the Mega Key Stone has been obtained from Tess.
The Absol permanently joins the player's team after the battle, staying in the first slot of their party.
It knows the moves Megahorn (Bug,) Night Slash (Dark,) Detect (Fighting,) and Psycho Cut (Psychic) when you earn it.