Badge Outta Heck

You gain this badge by defeating the Grox. This is extremely hard to do, even with cheats. The Grox control some 600 to 1,000 systems and thus will take a long while. The Grox possess few weaknesses and have formidable ships so you'll some help.

Grox Tactical Weaknesses

 * Terraforming planet to T1 will remove the Grox from the system
 * Antimatter weaponry with shield and extreme health

Effective Tactics
You have three basic options when trying to defeat the Grox, terraforming, conventional warfare, or planet busting. If you go terraforming Grox into extinction you should have lots of Mega Energy Packs because terraforming takes a lot of energy. If you try beating them like a normal enemy you'll quickly realize you more powerful than standard weaponry. The only weapon that can take out swarms of Grox ships in one shot is the expensive Antimatter Missile. To eliminate cities your best option is using the Antimatter bomb, which can also destroy the enemy in single blast. You'll be in for a long and grueling war, but it is one the most fun! By the way, since your full empire halfway across the galaxy they can only do raids on your planets. The final way is to seriously pack up on Planet Busters and destroy all of their planets. This is immensely expensive but is also the easiest to use. If you cheat and have enough of them, this is your most effective option.

Possible Weakness
If you manage to find their homeplanet, which is marked by being completely red, you may be able to destroy the Grox Empire in one swift strike. All you have to do is either conquer, destroy, or terraform the planet to take over. With the homeplanet taken over the rest of the empire may fall apart, but I'm still trying to verify the effectiveness of this tactic.