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I was expecting this to be dreadful, but it was a surprisingly clean first try win. Lunatone is extremely passive even with PULSE2, so you can safely ignore it with a mon that resists its STABs and focus down the left side first. Shiv pulls his weight just fine in a 2v1.5 since Lunatone doesn't really contribute much for Baron. After it's down to a 2v1, Shiv will probably be (almost) out of gas, but it's nothing you can't handle at that point if you saved a faster mon for the end to preserve his Megazard's Flare Blitzes for the things that actually matter like Klinklang.
I think I like Baron as an antagonist way more than I like Sirius because Baron at least attempts to rationalize his garbage, even if his reasoning is shit and he's objectively evil (and that's before doing stuff like pushing a 20-something girl into a volcano for shits & giggles), but he doesn't come across nearly as cardboard cutout-y as Sirius did.
Bros the moon is a beautiful orangeish tonight, go check if you can see it.