Lol
Elgyem functions similarly to Porygon, and Porygon is "bait" for every Fighting-type in the tier, and there's at least one on every team. Most slow things are going to be bait for something and a good many of these have high usage anyway, and they have different issues; therefore Elgyem is not a worse case than mons of this category just because it's slow, it's only "bait" for different things.
Beating Meditite/Mienfoo/Pawniard (without Pursuit) is a damn good enough reason for me to run the Trubbish + Elgyem core, and I don't really need it for anything else. But don't forget the other important advantages that come with using this core, which include stacking Spikes and spreading paralysis, two crucial tactics that really help out a team offensively. It's also worth noting that the core beats the best cleric in the tier (Spritzee), to make sure that paralysis remains a problem for the opposing team. Sure, there's Chinchou for absorbing Thunder Wave, but it is beaten by this core as well because it has no super effective moves and they can both reliably recover health continuously while Chinchou cannot. It's also pretty widely accepted that Trubbish is like the best Knock Off wall of all time with its resistance to Fighting and its Sticky Hold + Berry Juice/Recycle combination. For the Pokemon that do give this core trouble, like Scraggy and Misdreavus... Trubbish/Elgyem is only 2 slots out of 6 for a team, and 2 mons being able to beat a handful of major ones (Meditite, Mienfoo, Pawniard, Timburr, Spritzee, Chinchou, other things that can't 2HKO and can't continuously recover health) while stacking Spikes and spreading paralysis is good enough for me when I teambuild.