Unicron is essentially the most powerful villain in the Transformers multiverse. He is the brother of Primus and first son of an extra-dimensional entity called The One. However, because Transformers was brought by different companies, Unicron has been portrayed differently throughout.
If you refer back the biographies it shows he has; Superhuman strength, stamina, durability, flight, cosmic awareness, able to create worlds, energy absorption, upgrading/creating transformers, adaptation, converting matter to energy and more
Despite being weakened he is said to still have no equal - and he displays the ability to create life; Galvatron: