|“||Now, let us celebrate the completion of my Shadow Pokémon plan in advance. I will personally see to the destruction of your Pokémon.||„|
Grand Master Greevil is the leader of the criminal group Cipher, and the main antagonist in Pokémon XD: Gale of Darkness.
After Cipher's destruction following the arrest of their leader Evice, the true leader remained at large based on Chief Sherles' investigations. Indeed, Cipher returned five years later under the leadership of its Grand Master, Greevil. Accompanied by his bodyguards and twin sons Ardos and Eldes, Greevil hides under the personality of a kind old man.
Under the nickname Mr. Verich, Greevil obtains favor of the sailors of Gateon Port by providing free food and drinks at The Krabby Club. During one of his visits, he and his bodyguards came across Zook pushing around Michael and his sister Jovi after they accidentally bumped into him. Greevil had Ardos defeat Zook in battle, where he chastised him for his actions and departed.
After Micheal defeats Cipher Admin Gorigan and shuts down the Cipher Key Lair, Greevil appears on a TV monitor and reveals himself as the leader of Cipher. He taunts Michael by claiming that he would never reach his headquarters on Citadark Isle, which is later proven wrong when Michael rides the Robo Kyogre towards Citadark Isle.
Once Michael defeats all Cipher members in Citadark Isle, including Ardos and Eldes, he challenges Greevil himself. Greevil summons XD001, a Shadow Lugia created by Cipher to be the ultimate Shadow Pokémon, to destroy Michael, but he defeats/snags it. Enraged, Greevil faces Michael with a complete team of six Shadow Pokémon.
After Michael defeats or snags all of his Pokémon, Greevil was unable to comprehend his defeat. Ardos encourages Greevil to blow up Citadark Isle to kill Michael, but Eldes protests and reasons with his father that they should stop. Eventually, Greevil agrees to Eldes to accept his defeat graciously, much to Ardos' anger. It is unknown what happens to them afterwards.
- Greevil's name is a combination of "greedy" and "evil".