In what episode does luffy fight Pacifista after time skip?

 

See answer here

 Luffy destroys the PX-5 Pacifista on Sabaody Archipelago in One Piece, Episode 521 with the title: “The Battle Begins! Show the Training Results!”.

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Episode Summary:

Luffy is brought to Fake Luffy who claimed that Luffy insulted him and so wants to take revenge. However, his chance for revenge got foiled when Navy soldiers arrived on the scene. A battle between the congregated Pirates and the Navy soldiers began, in which the Fake Luffy and his pirates held the upper hand. not long after, Sentomaru (Now an officially Navy) along with two Pacifistas (PX-5 and PX-7) arrives and turns the battle around in the Navy’s favor.

Fake Luffy and crew Sentomaru and Pacifistas

Shortly after the Fake Luffy got taken down and his impostor crew fled shortly after. Sentomaru then asked PX-5 to scan for the real Luffy in the crowd. Pacifista PX-5 identified and attacked Luffy.  Luffy then destroys PX-5 with one punch and runs to escape. During his escape Zoro and Sanji meets up with him just after defeating PX-7.

Shortly after the Fake Luffy got taken down and his impostor crew fled shortly after. then asked PX-5 to scan for the real Luffy in the crowd. Pacifista PX-5 identified and attacked Luffy.  Luffy then destroys PX-5 with one punch and runs to escape. During his escape Zoro and Sanji meets up with him just after defeating PX-7.

 

Luffy dodges beam

Luffy Beats Pacifista

Luffy Beats Pacifista with one punch