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"Moving Squid-ward" – On ReshiZard's Dominance, the (Mostly) Failed Attempts to Counter ReshiZard, and a Potential Savior, Malamar, in Two Flavors (Standard and Techy)
which is arguably better Ultra Ball or Nest Ball for the deck except when looking for Let Loose Marshadow
You don’t Nest Ball Marshadow. Ultra Ball does work, however.
I’ve played a lot of Ultra Mally and had good results using Marshadow GX to copy Ultra Necrozma’s attacks against PikaRom. I’ve also had success using Tapu Koko to get around Absol. I can certainly see Mimiku being useful going forward.