>>31148375The speed stat does not have any correlation with travel speed. Onix can dig at 50mph, and has a base speed of 70. Pidgeot can hit Mach 2, but until recently had a base speed of just 91. And then there's Whimsicott, the fluffy cotton pokemon, that has a base speed of 116. What the speed stat must then actually measure is some combination of reaction speed and initiative.
Vikavolt might be capable of high speed flight, but battles aren't a race, and it's not very good at responding to commands. Like having low acceleration in a scenario where you have to stop often.