Fusion Bolt is a strong, energy-efficient STAB move, making it the safest Charged Attack option for Zekrom. Wild Charge is slightly stronger but comes with a self-debuff, making it riskier.

Zekrom with Fusion Bolt is good in GO Battle League, but it's not a necessary condition for the creature to be good. Fusion Bolt and Wild Charge consume the same amount of energy, but the latter ...