The Electric Grubling is a variant of the regular Grublings, it specializes in Electric-type attacks. You're not likely to be short of energy when battling it, as it drops an unusually high amount of energy surges - on average 5 per hit. The high energy drop variety appears to have much more HP than your average medium level Grubling. Note, Eletric Grubling that is part of the Earth Island Mountain Boss Team drops energy at the same rate as other medium level Grublings.
The Electric Grubling is found in the Earth Island.