well idk about the untradable, if you look at the old swarm thread most of them were mid tier pokes anyway, and you could take out the starter swarms and replace them with some other mid tier, so no super rares in swarms.
it's a little bit like the halloween event, maybe make the way swarms show up differently than just spamming ingame tv's.
it was nice to see the whole server work together at halloween etc.