In Game Edit
Pikachu has very little options when it comes down to mashing buttons, plus Pikachu doesn't have much attacks. His stamina is extremely poor, but makes up for that with his excellent speed, agility, and powerful strikes. Pikachu's Volt Tackle attack also has amazing combo ability.
Thunder Jolt- A simple projectile that allows for stuns. Skull Bash- Takes time to charge, but nice for good damage.
Quick Attack- Very nice for escape purposes as well as good small aerial damage.
Thunder- Very nice for combos, regardless of where your opponent is.