There could be another angle to all this, and not what everyone here is thinking Trump's motives, or end game are about. All of this appears he is trying to win thru the SCOTUS or by Congress. However, it all could be just a distraction for the only purpose of giving Trump and his corrupt administration time to destroy records of 4 years of corruption, and very well possible Treason, before Biden's transition team is everywhere, not allowing them to destroy anything without being caught.
Yes, he could pardon everyone, but if the corruption became public, and the records not destroyed, It's the republican party that will be completely destroyed. Meaning this all could be to cover up how deep the whole republican party is involved. The very reason so many republican Congress members are Silent or supporting Trump's actions.