"We took his custody through a transfer warrant (from Surat court)," Assistant Commissioner of Police K N Patel told PTI.
"Our officials have already left Surat with Hardik and they will reach here at midnight," he added.
Surat police first booked him for sedition for allegedly advising a local youth to kill the police rather than commit suicide.
He may be produced before a metropolitan court here tomorrow.
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The FIR said Hardik had instigated his community to adopt violent means to "wage war" against the Gujarat government. It relied on transcripts of various telephonic conversations and speeches made by Hardik and other members of Patidar Anamat Andolan Samiti (PAAS) wherein they allegedly instigated the Patel agitators to "wage war against the state government".
It also cites Hardik's speech where he asked the community members to "throw bomb in the state Assembly", and a conversation where Hardik's aide Dinesh Patel was told by an unknown person how they had eliminated a couple of policemen in Surat on August 26, after the August 25 rally in Ahmedabad.
The violence which followed the rally claimed 10 lives across Gujarat.