So Mega Floette has the power of the ancient weapon, and Mega Zygarde A has the power of the new weapon? And the entire city is designed to concentrate and collect infinite energy in the Eiffel tower, to use as a weapon, which was the plan of the now-mecha bad guy. Very interesting. The concentration and collecting of infinite energy also explains the wild mega Pokémon rampaging in the city, like radiation spreading, and without a trainer they lose control.. and explains why the bad guys want to run a fight club at night all over the city, more battles means more infinite energy!