Quite simply, yes.
For a better example, say I have a fully EV trained Garchomp with a Mawile that needs training. Garchomp EQs a horde of Bellsprout, giving each Pokemon 5 Atk EVs. Garchomp is already trained, so doesn't get anymore. Mawile also gets 5 Atk EVs, as it gained experience from the battle through the EXP share, and EVs are transferred through gaining experience. If Mawile was holding the Item Power Bracer (specifically for Atk EVs), it would +4 for each enemy. So (1+4) x 5 = 20 Atk EVs at once! If Mawile is infected with Pokerus, this doubles the EV gain.