About This File
This is a Wild Area event held by Sword and Shield. This event hosts Gigantamax Sandaconda and Gigantamax Drednaw.
This event is also presently the only way for Sword and Shield players to catch East variant of both Shellos and Gastrodon.
(Apparently, I forgot that the one that doesn't show up in the wild is West Form.)
To import these files into your save, use PKHeX's block importing function. Our tutorial should guide you through it.
Our first post of this page would contain some data relevant to the importing stage.
There's info and some common questions regarding Wild Area Events here.
To see other Wild Area Events, here.