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Lysandre could been almost the same, in the final battle he could had a team of 5 and he could start sending 2 grunts instead, each one having just one pokemon, starting the battle a double one.
The battle goes from double to single when you defeat his grunts. Lysandre could conserve his techno glasses but the other machines could changed to two gadgets each one with a mega stone allowing him to make 3 mega evolutions, one by him, and the other 2 by their gadgets turning off their glowing once their megaevolution is done.
He could had a mega houndoom evolved by him, and a mega gyarados and absol by their machines.