The guy's Safari must have all three Pokemon unlocked
That person who owns the Safari you want to catch Electrabuzz in has to defeat the E4 and thus unlock the third and last Pokemon. Until then the other two Pokemon will all have their normal abilities. You also need to be online with the friend at least once.
The chance of finding a HA Pokemon is around 33% - 75 %. But these are from forums and reliable sites like Bulbapedia have not yet confirmed this.
Other Methods
Events
During 2014 there was a HA Electrabuzz Event. If you got your hands on these and bred them with a HA Ditto. (The Event Pokemon were male) You would have a 20 % Chance of getting a HA Elekid.
Forums
Reddit, Nugget Bridge Marriland, PS all have a place where you can hunt for HA Elekid families.
Hack
PkHeX and Powersaves that help you out although there is a chance it can break your game.
