Take an existing 3 stage pokemon line that look like they could pass for pseudolegendaries and adjust their stats so it equals 600.

Is that pokemon more viable than a true psuedo?

For instance, imagine haxorus with this stat line:

hp: 106
atk: 147
def: 100
SPatk: 60
SPdef: 80
spe: 107

It would shit on any dragon and it's only 600 BST.