According to the sets official release notes from Wizards of the Coast, the battles serve as a thematic tie-in to the overarching story behind March of the Machine, where the cultist army of Phyrexians have launched their invasion of the entire multiverse
Its Legendary, and therefore more tutorable
Most GX, V, and ex are bombs, and you should consider adding them to your deck even if they don't match the energy types you're trying to work with, especially if they're Basic Pokemon
There is no need to fear any 200+ HP cards the game only includes Pokmon from the first generation, and some Stage 2 Pokmon are lucky to even have 120 HP
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Once your Arceus ex is on the active spot, continue using Ultimate Force each turn to deal 130 damage