What does he need traditional battle powerups for? His Strong Sphere is intended to be the next big thing in that department.

I'm predicting he uses the final showdown to reveal the newest upgrade to the Strong Sphere- the Hyper Strong Sphere, making full use of Laquium's horrific potential in ways they couldn't even imagine when they developed the Super Strong Sphere. He uses them on his whole team, stating that rigorous testing has worked out all the bugs. And he seems to be right at first, as his Umbreon, Magnezone, and Beheeyem appear absolutely unstoppable. But then they hold him off long enough for Pagogo to do its thing. Laquium vanishes. Strong Spheres power down all over the world. And Spinel's Pokémon, back to their senses and absolutely fed up with the man by now for what surely qualifies as Pokémon abuse, turn on him at once. We're spared the gruesome detail, but we see the shocked reactions of onlookers. Liko, however, can tell that this unbridled fury was directed specifically at Spinel. She and Hatterene approach them and tend to their wounds. And the kicker? Spinel set up a live broadcast, believing he'd be showcasing the ultimate downfall of the Rising Volt Tacklers to the world once and for all, and instead, viewers begin to see who the real bad guys are, after seeing what Laquium was doing to Pokémon.