To find the Full Set of X-01 Power Armor in Fallout 4 you must be level 28+. It’s located in an unnamed building just south of Custom House Tower.
You can upgrade it up to “Mk. VI” at any Power Armor Station. This will further increase the armor rating.
X-01 is the strongest set of power armor in the game! This is a guaranteed location for the full set if you are level 28 or above. If you are under level 28 you will find a weaker armor such as the T-45. So don’t go there before reaching level 28 and come prepared to fight off the Sentry Bot.

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