Tl;dr for the people who can't read.
-Pariston sets up a scenario to learn about Ging's hatsu.
-Ging reads him like twilight, uses an ability that isn't his own, and calls him out.
-Pariston is more butthurt.
-Big robot finally talks. It uses other peoples nen for fuel (think Tsubone's hatsu).
It can also mass produce emission weapons using other people's nen.
-Pointy-ears is okay with Ging being 2nd; he just didn't like the methods that Ging was using to earn it($$$)
-Ging accepts his faults, apologizes for it. Resolves his difference with the rest of the crew.
-Ging admits he likes the crew.
-More Pariston:Ging tension
Also, copying somebody else's hatsu doesn't necessarily have to be the result of a nen ability; for reference, refer to Wing's explanation.