Eusine is a wandering trainer obsessed with Suicune.
Eusine tries to sell Silver some paintings of Suicune. Later during the Safari challenge, he catches Silver using his Weavile to weaken wild Pokémon because he hadn't listened to the rules. Eusine explains the rules to him. Silver shows him his plate but Eusine doesn't know what it is. Moments later, Eusine bursts into tears and snot due to Koffing gas. Petrel causes the bridge underneath them to collapse, but Silver grabs Eusine and saves his life.