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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 they 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 either found one of Shadow's canisters or created a copy of Shadow, compelling 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 Chaos Emeralds to power it, although only six could make it fire before the seventh made it fall to the planet as a megabomb. It is unclear why Robotnik created it, although it is possible that is in the same way as in the games: to stop Black Doom.
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.