Ignoring the fact that Rideman has a long chain and hay balls he has a gun. Let’s face it, one gunshot and Greenman’s out for the count. Not to mention that Rideman also has a super form. Greenman loses. Rideman wins.
Decay can steal people’s energy and life force if he touches the opponent. Of course he won’t get to touch Gon, because of Gon’s super speed. All Gon has to do is pound the ground to win. Gon wins.
Punk is a piranha type navi. His attacks are cool and his character design is cool. Add to that explosive offensive power and you have a navi that could beat Greenman by the dozens. Punk wins.
Vent has the powers of the 4 Legendary Guardians and X and Zero. Wario couldn’t stop him even if he only has Zero and X. Zero and X’s powers rolled into one is way too tough for any mere mortal. Vent wins.
Gateman is a navi in Beast who fought beast out Megaman. He lost pitifully but he still tried and that’s what counts. Greenman couldn’t beat Megaman back when he was a normal navi before customization. Gateman wins.
Gon has super speed. That’s enough to handle Chrome. Chrome just can’t really do much against Gon. He won’t be able to get near Gon and Gon can shoot energy blasts from afar. Chrome is doomed. Gon wins.
Knightman is one of the later navi’s who learns how to crossfuse. Because of this his power exceeds Greenman’s. Greenman can’t crossfuse and probably never will. Knightman’s wrecking ball would beat him. Knightman wins.
Bass is so much cooler than Kirk it’s scary. Just by powering up he could obliterate Kirk and one energy beam and Kirk’s out. Kirk is too weak too even think about fighting Bass The King of The Undernet. Bass wins.
Quickman is faster and stronger than Greenman. He could beat him pretty fast. Greenman is sinking pretty down. At this rate he could have well over 30 losses. That isn’t very good. Quickman wins.
Hibito has a fire sword. With it he’s now at a level where he can fight Wario at an equal level. Wario has powerful moves, that could take out anybody. Can Hibito take them is the question. With his fire power he makes it. Hibito wins.