Defeating Max Cryogonal with one Pokémon and no XL candy investment

Here’s the video of an example battle: https://www.reddit.com/u/gereffi/s/aQCZufZLX7

This Metagross does not have particularly good IVs and no XL candy was spent on powering it up or upgrading its Max moves. Beating Cryogonal has been very straightforward and consistent when it doesn’t use Solar Beam, and with five different moves it usually only takes one or two restarts to get it to not have Solar Beam. (I did beat it once while using Solar Beam, but I needed to use more shields. It took a lot of time and I defeated it just after its attacks powered up.)