The metal which liberates hydrogen gas with dilute nitric acid is

As nitric acid is strong oxidizing agent, so metals don't liberate ${\mathrm{H}}_2$ gas with ${\mathrm{HNO}}_3$ because as soon as hydrogen liberates, dilute nitric acid oxidizes hydrogen into water.

Manganese and Magnesium are some of those metal that can liberate ${\mathrm{H}}_2$ gas with very dilute nitric acid because these metals acts as strong reducing agents.