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I KNOW "all pokémon" won't appear in Champions at once, which implies a regulation rotation, akin to what goes on in the main games' VGC monthly comps (they've already implied the VGC comps this year will be Tera vs Mega with the reveal vid pitting each vs each other AND VGC '26 being played on Champions).
You seem to be labouring under the delusion they're supposed to or attempt to REPLACE showderp. They're not, they're just taking aim to kill it, by FINALLY releasing an official product that competes in its market. And we all know copyright judges side with the Intellectual Property holders.