Yamper

Yamper is an Electric-type puppy Pokémon serving as the pet of the Cerise family, particularly attached to Chloe, whom it obeys despite not being officially her Pokémon. Trainer: Professor Cerise/Chloe. Height: 1'00". Weight: 29.8 lb. Type: Electric. Weakness: Ground. Resistances: Electric, Flying, Steel. It was gifted to the family before the series and quickly bonded with Chloe.

General Electricity

• Generates electricity by nuzzling with Pikachu. (source) (^5)
• Releases large amounts of electricity from its body. (source) (^29)
• Shocks Ash, leaving him charred. (source) (^2)

Spark

• Launches forward at high speed with Spark, plowing through Gengar’s Shadow Ball and sending Gengar (89.3 lb) flying. Gengar’s Shadow Ball could create a powerful explosion when captured by Pikachu’s Electroweb. (source) (^11)
• One-shots a Fearow with Spark (Fearow is weak to Electric-type attacks). (source) (^29)
• Alongside Pikachu, chars several people and Pokémon with Spark. (source) (^59)
• In combination with Eevee, overpowers Pelipper’s Hydro Pump with Spark and sends it flying (Pelipper is weak to Electric-type attacks and controlled by Team Rocket). (source) (^49)

Strength

• Pulls Chloe by grabbing her skirt. (source) (^29)

Speed

• Leaps in front of a close-range Shadow Ball to protect Chloe. (source) (^11)
• Dodges attacks from Fearow. (source) (^29)

Durability

• Frozen solid by Gengar’s Ice Punch, then thawed by Scorbunny’s flames. (source) (^11)
• Takes a direct Shadow Ball from Gengar, left reeling. (source) (^11)
• Takes a Wing Attack from Pelipper that overpowers its Spark. (source) (^49)

Senses

• Detects an invisible Gengar. (source) (^11)
• Hears Chloe approaching the lab. (source) (^50)
• Picks up Chloe’s scent. (source) (^49)
• Tracks Grookey’s scent. (source) (^59)
• Sniffs out an invisible Gengar. (source) (^11)

Misc

• Has an extremely rubbable belly. (source) (^50)