If Raikou's checking dual birds, you're switching in and then Volt Switching. Leftovers recovery is almost insignificant for that purpose. On the other hand, everything else it's regularly used to check hits it specially, giving Assault Vest a fair bit more utility.
On another note, Fairy usage is still contracting around Clefable (for defensive purposes) and Mawile (for offense). Togekiss' SR weakness and inferior defensive ability to Clefable, and on the other hand, the sinking popularity of the double bird strategy (in which Togekiss could function as a useful lure), are costing it a lot of usage. Azumarill is slowly being edged out as well as more reliable defensive cores are popularised, countering the threats which it was previously used to check.
On another note, Fairy usage is still contracting around Clefable (for defensive purposes) and Mawile (for offense). Togekiss' SR weakness and inferior defensive ability to Clefable, and on the other hand, the sinking popularity of the double bird strategy (in which Togekiss could function as a useful lure), are costing it a lot of usage. Azumarill is slowly being edged out as well as more reliable defensive cores are popularised, countering the threats which it was previously used to check.