I don't think it's common in many countries. Only in those that have not kept up with the times since the end of the 18th century.
Not an historian or legal expert, but I believe that the UK does have a Royal Prerogative of Mercy, which IMO has been appropriately exercised in the absence of warranted legislative action relatively recently.
Wikipedia has an interesting article on pardon powers worldwide, which I'm actually glad I had a reason to investigate. And there are interesting links to related articles on clemency, expungement, commutation, etc.
Of course, pardoning co-conspirators to avoid personal legal jeopardy is at best suspect. But pardoning co-conspirators in the US deprives the pardonnees the opportunity to "take the Fifth," that is the right to refuse to provide testimony that might incriminate themselves. Once one has been absolved of the accused crimes, one can no longer pretend that testifying against others would subject themselves to criminal liability. If one's co-conspirator gives a person a pardon, that person can no longer claim that testifying puts themselves in legal jeopardy. (Side-eye at Michael Flynn, and probably many more in the next couple months.)
Good news, countdown-wise . . . I think. One of the big local teaching hospitals may start administering covfeve-19 vaccines to front-line staff starting Friday, assuming no glitches. Of course, glitches are not an option, but rather are standard features from the factory.
Hopefully that means the family doctor in the family -- in a slightly less risky front-line job in private practice nearby -- gets her first shot before New Years.
Countdown-wise, anyone wanna place bets on when I get my Pro 1? Will it be before or after my Xperia X dies? Some info to inform your prediction: the main camera on the Xperia has died, the touch screen only activates on every other try, and now the display requires light pressure on the bottom half to make it go from abstract art to usable after unlocking . . .
Or, will I get my vaccine or Pro 1 first? I really want both . . .