Rejecting this suggestion as the original reason is no longer
valid:
Item trades nowadays are no longer done by attaching items to
Pokemon, so I'm not sure if this feature would still be necessary.
Since the reason for this suggestion is no longer valid, it's
impossible to know whether the "support" shown on this suggestion
is still valid.
If you feel like this feature is still needed (for a different
reason), then feel free to open a new suggestion thread for it.