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Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Gerald sometime created Space Colony ARK, trying to develop the Ultimate Life Form. After the Biolizard, he finally created the Ultimate Life Form, Shadow the Hedgehog. It is unknown if he created Shadow with Black Doom or not. However, Maria died trying to protect Shadow from G.U.N.(although in the dub, they took her away.), because the military feared Gerald would use it to take over the world. Gerald was then put into prison on Prison Island, taking on a new purpose: get revenge. He was able to compell Shadow into getting revenge on Earth. He was found out and executed, but not before creating a video revealing his plan when all seven Chaos Emeralds were put into the Eclipse Cannon.
Space Colony ARK was the creation a lab of Robotnik before G.U.N. came and killed Maria. It was then sealed off.
The Eclipse Cannon
The Eclipse Cannon is a weapon on Space Colony ARK with enough firepower to destroy an entire planet. It needed the seven Chaos Emeralds to power it, although it was demonstrated that with six Chaos Emeralds, it can destroy half of the Moon. It is unclear why Robotnik created it, though.
The Biolizard was one of Robotnik's prototypes of Project Shadow. It needed a life support system, so it was no use to Robotnik and he sealed it away at the core of the Eclipse Cannon.
Shadow is Robotnik's most successful creation, although it is unclear how he was created. Shadow could go as fast as Sonic, teleport using Chaos Control with just one Chaos Emerald and transform into Super Shadow.