It is definitely possible, yes.
And Psuedo-Legendaries are mons that have at least a Base State Total of 600 as well as three stage evolutions and 1,250,000 Experience at Level 100. Essentially, they are mons that aren't considered to be Legendaries but are close or equal to the power of them. Acknowledged Pseudo-Legendaries would be Dragonite, Tyranitar, Salamence, Metagross, Garchomp, Hydreigon, and Goodra. It is a fan-made term by the way if you were wondering.
If you wanna know more, check out this page -> Pseudo-legendary Pokémon - Bulbapedia - Bulbagarden