To remove the presidential pardon power, you'd need to [amend the Constitution][1]. Getting [two thirds of both Houses of Congress][2] to pass any amendment in the foreseeable future seems highly unlikely if not downright inconceivable.

[1]: https://constitution.congress.gov/browse/essay/artII-S2-C1-3...

[2]: https://constitution.congress.gov/browse/essay/artV-1/ALDE_0...