HOW TO UNLOCK IN 3DS? Play 10 matches or beat Classic Mode with two or more different characters.
When charging PK Flash, move it in any direction with the Control Stick. Direct PK Thunder into Ness to launch him in the air and damage opponents with electricity. This also acts as a recovery.Heal by absorbing projectiles with PSI Magnet. Ness doesn't shout the name of this move. One too many syllables, perhaps? Nah, that can't be.
Moveset*
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Neutral Special
PK Flash
Up Special
PK Thunder
Side Special
PK Fire
Down Special
PSI Magnet
neutral SPECIAL 2
Rising PK Flash
up SPECIAL 2
Lucas' PK Thunder
side SPECIAL 2
PK Fire Ω
down SPECIAL 2
Explosive PSI Magnet
neutral SPECIAL 3
PK Freeze
up SPECIAL 3
PK Thunder Ω
side SPECIAL 3
PK Fire α
down SPECIAL 3
Lucas' PSI Magnet
Taunts
Up Taunt

Side Taunt

Down Taunt

Standard attacks
Neutral

Neutral Combo

Dash

tilt attacks
Up Tilt

Down Tilt

Side Tilt

smash attacks
Up Smash

Down Smash

Side Smash

aerial attacks
Neutral Aerial

Up Aerial

Down Aerial

Forward Aerial

Back Aerial

grab attacks
Pummel

Up Throw

Down Throw

Forward Throw

Back Throw

Smash Ball
Final Smash

PK Starstorm
*All pictures of moves for all characters are gathered from official sources and from pictures and videos without detailed explanations, and some are subject to change.