She uses one Pokemon from every generation.
B- Chesnaught/Delphox/Greninja (Chosen before match) The attack is different depending on the Pokemon:
Chesnaught: Spiky Shield (Serena is enveloped in a shield for a short time that counters all attacks)
Delphox: Mystical Fire (Delphox uses the stick at the end of its tail to create fire. It then breathes on it and it fires at the opponent)
Greninja: Water Shuriken (Greninja throws a water-enveloped Shuriken at the opponent)
B-Up- Loppunny (Bounce): Loppunny bounces high in the air, and then lands down on the ground, hoping to crush an opponent.
B-Left- Metagross (Psychic): Metagross creates a ball of enrgy and fires it at the opponent. This may also cause a random status condition.
B-Right- Lilligant (Magical Leaf): Lilligant fires leaves at a certain opponent. It never misses.
B-Down- Dugtrio (Earthquake) The ground Dugtrio is on gets rumbled, causing damage.
Final Smash: Mega Ampharos: Serena sends out Ampharos, and uses her Mega Ring to make him Mega Evolve. His attacks are SUPER POWERFUL, and only comes back if he tries to use a Smash ball or after a certain period of time. His attacks are:
B- Charge Beam- Ampharos charges up electricity, then fires a powerful beam. The more it's charged up, the more powerful it is.
B-Up- Take Down- Ampharos grabs the opponent, then throws him down to the ground to get some extra air.
B-Side- Wild Charge- Ampharos creates a ball of lightning around him for about one second. Anyone caught in it gets damaged.
B-Down- Dragon Pulse- Ampharos kneels down and breaths a special flare. It may also trip the opponent.