Eris is one of Ayden's Pokémon currently residing at Ayden's home in Phenac City. She originally lived in Chargestone Cave where she caught Ayden in an electrified net. Ayden vowed to catch the spider, during which she evolved into a Galvantula before being caught.
As a Galvantula, Eris has excellent ranged attack capabailities and her ability almost ensures that she never misses a hit. She can easily weave electrified webs to ensnare and paralyze her opponents, leaving them helpless and motionless while the finishes them off.
Born and raised in the Chargestone Cave, Eris was rather playful and devious, which would usually get on the nerves of other Pokémon. One day, whilst Ayden was traveling through the cave to reach the next town, Eris ensared Ayden in her electrified net. Ayden, angered by this, vowed to get back at Eris. Ayden chased Eris through the cave, trying to catch her, during which she evolved into Galvantula. Eventually, she fell in battle and was captured.
She was primarily used by Ayden during her time in Unova and now currently resides in her home in Phenac City.