Legendary event
Legendary events are a type of limited-time event in Pokémon Masters. These focus on a specific sync pair with a Legendary Pokémon.
Lurking Shadow
The first legendary event ran from December 5 to 18, 2019. It was focused on the sync pair, Giovanni and Mewtwo. As with other events, players can earn vouchers to exchange with special items at the shop. Players can also need to collect 800 Custom Voucher 1 to acquire the area info needed to team up with Giovanni and Mewtwo. Custom items can also be obtained to unlock moves and passive skills, increase the level cap and their potential.
Unlike previous events, this legendary event may return. As a result, vouchers are not automatically exchanged with coins, but will carry over.
Plot
The event starts with Giovanni asking Mewtwo to sow seeds of chaos.
At the Pokémon Center, Trista relays news of a strong sync pair causing trouble and warns the player to take caution when exploring the beach.
Brock, Misty and the player go out to the beach to help stop the trouble. They overhear some Team Break masked men discuss how strong the Trainer is and wonder whether they can make him their boss. However, one of them reveals that he had previously stated not being interested as he was already leader of Team Rainbow Rocket. Brock and Misty interrupt their conversation and Misty realizes that this must mean that Giovanni has come to Pasio. Brock explains to the player that Giovanni is the leader of Team Rocket in Kanto. They decide to stop him but the Team Break thugs try to stop them and start a battle. After being defeated, the masked men leave.
Brock, Misty and the player head into the cave where Giovanni is. After some time, they eventually find him. Misty confronts Giovanni asking what he is up to despite Team Rocket having being disbanded. Giovanni is surprised that Team Roket is disbanded and guesses he is doomed to be a criminal no matter which world he is in. Giovanni reveals he was able to mine a sync stone from the cave. He reveals his aim to bend the power of the sync stone to his will and to unleash the hidden power in them. He brings out Mewtwo and battles them to see what the sync stone is capable of.
After the battle, Giovanni sees that it is possible for the bond of a sync pair to manifest great strength. Brock doubts Giovanni will give up on seeking power and believes he was not treating that as a serious battle. Giovanni remarks that the battle was a test run. He dares the player to follow him to for a rematch and then disappears with a snap of his fingers.
Battles
Single player
| Name | Trainer | Pokémon | Completion Rewards | ||
|---|---|---|---|---|---|
| Left | Middle | Right | |||
| Get to Giovanni! |  Masked Man |
 Grumpig Weakness: 
|
 Gengar Weakness:
|
 Mareanie Weakness: 
|
75 coins Custom Voucher 1 Custom Training Machine |
| Mewtwo Strikes! |  Giovanni |
 Staraptor Weakness:
|
 Mewtwo Weakness:
|
 Drifloon Weakness:
|
150 coins Custom Voucher 1 x2 Custom Super Voucher 1 Custom Training Machine |
Co-op
Once per day, the rewards are tripled.
| Name | Difficulty | Trainer | Pokémon | Completion Rewards | Battle Rewards | ||
|---|---|---|---|---|---|---|---|
| Left | Middle | Right | |||||
| Take Down Giovanni! Round 1 | Normal | Giovanni |
 Crobat Weakness: ↓  Dusclops Weakness:
|
Mewtwo Weakness:
|
 Honchkrow Weakness: ↓  Sigilyph Weakness:
|
150 coins Custom Voucher 1 Custom Super Voucher 1 Custom Training Machine |
Custom Voucher 1 Custom Super Voucher 1 Custom Training Machine Custom Super Training Machine |
| Take Down Giovanni! Round 2 | Hard | 300 coins Custom Voucher 1 Custom Super Voucher 1 Custom Training Machine Custom Super Training Machine | |||||
| Take Down Giovanni! Round 3 | Very Hard |  Solrock Weakness:
|
Mewtwo Weakness:
|
 Lunatone Weakness:
|
500 coins Custom Voucher 1 Custom Super Voucher 1 Custom Training Machine | ||
| Take Down Giovanni! Round 4 | Super Hard | ||||||