>>19843593a STAB thunderbolt is going to hit harder than any hidden power on everything except leafeon and other jolteons, and shadow ball hits both of them neutrally
252 SpA Jolteon Thunderbolt vs. 4 HP / 0 SpD Flareon: 121-144 (44.4 - 52.9%) -- 84% chance to 2HKO after toxic damage
252 SpA Jolteon Hidden Power Water vs. 4 HP / 0 SpD Flareon: 108-128 (39.7 - 47%) -- 0.4% chance to 2HKO after toxic damage
>>19843608I've already got shadow ball on jolteon though. Water/ice hits all others neutrally except other vaporeons. Hurrdurr synchronoise. Maybe acid armor or baby-doll eyes or charm?