Here are the three ultra-space pokemon

Ziazi: He has a different type of poison that causes bloating. He rarely uses much this since he finds that his prey would inflate more than he thought. He's a bit mischievous and does like to sting bellies and that would enough to give someone a very full belly.

Werol: He doesn't have a belly but that doesn't stop him from containing anyone or anything that his maw hands or his own maw reached. He can be friendly when he's feeling very full.

Grey: He's quiet but he tends to follow whatever light comes by. He's quite fascinated with Leosoul and started to form a bond with him ever since they merged and became the Dawn Wings form and shared the body.