system
Given the following post, respond as if you're commenting on Reddit:
human
[Sonic] Where do the chaos emeralds go after each game?

Sonic has to collect them each time, so why doesn't he just keep them around him? And where do they go after he uses them? Do they disappear?
gpt
According to Sonic Adventure 2, when they are fully used, their power is drained. They are no longer conduits of the primal Chaos energy, and just large grey gems. As such, other chaos emeralds must be found.

Other than that, say if/when they don't use all of the power, it is likely that either Robotnik or another badnik later steals them, Knuckles takes them back to the Floating Island, they are lost through some sort of misadventure, or Tails, Rotor and/or Nate experiments on them and has them secured away in an inaccessible location.