>>29297540That calc is BS for two reasons.
1. Explosion kills itself leaving any for of future utility or fodder out of the question.
2. Ain't even STAB, with a move with such High Base Power, STAB plays a huge roll.
The following calc has it's base attack lowered in order to match Electrodes and get a similar result.
252+ Atk Life Orb Victini V-create vs. 4 HP / 252+ Def Eviolite Chansey: 308-364 (47.9 - 56.6%) -- 89.1% chance to 2HKO