You can use Paralyzing Palm to pick-pocket human NPCs. To do this without upsetting factions, save and attack the desired target in V.A.T.S. with an unarmed weapon, reloading until you paralyze them.

Does Paralyzing Palm work with power fist?

Note that in order to perform the Paralyzing Palm, you must be using bare hands or an Unarmed class weapon such as brass knuckles, a power fist, et cetera.

What is the strongest unarmed weapon in Fallout New Vegas?

Put simply Pushy is the best unarmed weapon in the game. The only stronger weapon is a Ballistic Fist but that has a ridiculously high strength requirement for very little improvements.