Okay, we already know that the UltraLive ability that Ginga has is similar to the Gokai Changes that the Gokaigers use.
However, I think X was using something else that the Gokaigers used: His own version of their Greater Powers.
The Greater Power of Ultraman Zero was the Ultimate Aegis.
The Greater Power of Ultraman Max was the Max Galaxy.
The Greater Power of Ultraman Nexus was the Armed Nexus.
And the Greater Power of Ultraman and Ultraman Tiga was the Beta Spark.
He gained all of these powers through meeting those Ultras, just like how the Gokaigers got their Greater Powers through meeting their predecessors. The similarity is rather uncanny, I have to say.