Checked out Exp. Share and noticed that the card does not mention that the tool needs to be discarded when used like former versions. Thus this mean that one could have a bench sitter with Exp. Share attached, who hords the energies from your knocked out Pokémon?
I assume you're talking about EXP. All, right?
When using the effect of EXP. Share, you do not discard it after moving the energy. It stays on that Pokemon until knocked out, or discarded by another effect. So, in essence, you could have a Pokemon hoarding energy.