From the plethora of Power Armors that are available in the game, the most advanced and maybe the best Power Armor that you can get in Fallout 4 is the X-01 series.
This isn't the only place. Another spawns as Xo1 if your 30+ as well. But you must find it at 30 or above. If you find it sooner it will stay a T51. It's one of the military checkpoints.
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