The BJP was running away from answering questions but Rahul Gandhi was forcing it to be accountable, the Congress' Rajasthan unit chief said.
Support for the Congress president's leadership also came from Sonia Gandhi who said in her address to the Congress Parliamentary Party today that Rahul Gandhi was her boss too, and asked party MPs to work with him to strengthen the party.
"Mr Gandhi is relentlessly taking on the BJP leadership for all its failures (and) that is giving a lot of energy and confidence to opposition forces," Mr Pilot told PTI.
"He is the only person who is going to be able to take on Mr Modi and mount a formidable challenge to dethrone the BJP in 2019," said Mr Pilot, under whose leadership the Congress won the key Rajasthan bypolls recently.
The way the Congress president has been aggressively taking on the BJP for its failures has attracted many anti-BJP forces and is galvanising the opposition, he said.
According to Mr Pilot, the BJP was becoming "nervous" with Rahul Gandhi constantly asking them questions on the promises made by them.
On whether Rahul Gandhi was the best choice for leading an alliance against the NDA in 2019, Mr Pilot said, "I will only say this much -- that nationally the only party that can challenge the BJP is the Congress party and under Rahul Gandhi's leadership it is now fully geared up to take on the BJP whenever the Lok Sabha elections happen."
All anti-BJP forces will collage together when the time is right, Mr Pilot said.
Talking about the victory in the Rajasthan bypolls, Mr Pilot said the quantum of loss is worrying the BJP.
"I am sure two months later, we will win the Karnataka elections also," he said.
Congress wrested the Alwar and Ajmer Lok Sabha and Mandalgarh Assembly seats from the BJP by impressive margins last week.
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