Can Guldo Stop Time?

Guldo stops time with his special ability While time is stopped Guldo can either run and hide or attack, however Guldo can not hold his breath for very long, which means that he can only stop time for a very short time, while it also uses up a lot of his energy; so repeatedly using it can wear him down very quickly.

Can Goku freeze time?

Goku managed to become immune to its effects using Super Saiyan Blue Kaio-ken. This, however, pushes Hit to further evolve his time manipulation ability to be able to actually freeze his opponent in time while mid-Time-Skip.

How strong is Guldo?

Guldo is stated to have a power level of 11,500. Due to the fact that Frieza expected the Ginyus to be able to fight Goku (when they teamed up with Cell in Hell), it is likely that Guldo increased to around 400,000.