Thing is, each hair that falls on the ground stores electricity and works like a capacitor.
Jolteon can't control lost hair. Otherwise, Jolteon will never try to shock a trainer once his fleshy meat enters the cave that is hidden by two lips or by a ponut so tight that the trainer gives Jolteon all the volts.
Of course, you can also make use of his or her interesting movepool. Ruling out electric moves, a Jolteon is capable of learning the same moves as all the other Eeveelutions (Baby-Doll Eyes, Charm, Captivate, etc.).
Let's assume your Jolteon is female. One of the very rare ones. Make your Jolteon use Double Kick for example and tell her she's a rape victim and stuggling makes your boner harder! Jolteon will fall for that and tries to free from you by using Double Kick. Of course you'll not be hurt because you are fastening her twitching legs.
Agility will make her be much faster than usual. This means pounding gets excited as she's calling the tune to you. It goes so violently, you don't need to thrust in her anymore, everything will be under her control.
Last but not least, we all know that Jolteon has no tail. But that doesn't stop us from entering her cave, does it? An ass so spiky not only relaxes to make you not hurt but to make you push your member deep inside her womb. A tail means more muscles around an ass and more muscles means less penetraion points. Jolteon is the Eeveelution where your dick reaches in the most. No other Eeveelution will make you go that deep like a Jolteon does. Even a Vaporeon in missionary position fails to have a human penis reaching 9 inch deep.