Alpha 2

population (including moons and connected dwarf planets) = 25 trillion

Alpha 2 used to be a made entirely made out of water. With many giant sea creatures as the only inhabitance. However, 2,000 years ago Earth was in a crisis and the core was about to release all it's magma and energy at once. So an advanced branch of humans called the "Crawlers" agreed to warp all the healthy and intact land masses to Alpha 2 in an attempt to save Earth.

Over many years they continued to do this to other endangered planets and even take the whole planet and make it a moon or connected planet.