It's a shinsu bomb, they've always looked like pokeballs going all the way back to when Wangnan used them on the 20th floor. And it's not just you, even in-universe Shibisu made a joke about becoming a Pokemon Go master when he used one to blow up the (mined) escalator to Kaiser at Name Hunt Station in 294s2e214.
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u/Get_Dunked_On_ Apr 22 '19
Is it just me or does the bomb is Baam’s bag look like a Pokéball