[quote=@Krayzikk]
<Snipped quote by p1ssaragi>

We could simply create a new elite unit within Zoom, a la Cyclops team. Give them their own ace, some tweaked versions of classic Zeon suits, and a buffer of mook units.

Boom. Instant antagonistic force.
[/quote]

Expanding on this a little bit;

We presently have four units to field, plus the ship. We can create a decent antagonistic force using a relatively low amount of actual antagonists, and by creating a core of recurring ones, we also create enemies that can be eventually defeated to indicate victory without taking out the ace until much later. For example, we could have a team primarily composed of a Gelgoog Jäger for the ace (that Gelgood variant is utterly terrifying), a Rick Dom II for one of his subordinates, a Zudah for another, and then have a Mobile Armor acting as a larger support unit. Pepper the ranks with Rick Dom and Zaku pilots and you have a reasonable force of antagonists.

The Jäger, Rick Dom II, and Zudah are all high end units capable of fighting on par with literally anything we could throw at them. The Gelgoog actually has specs exceeding (pretty far exceeding, in fact) anything we can throw at it, up to and including OYW Gundams. It would make for an excellent ace unit.