One of the Legendary Pokemon Beasts in Raid Battles is Raikou. He is with 3349 Max CP, 241 Attack, 210 Defense and 180 Stamina, and is part of the Electric Type. As such, his weakness is Ground Pokemon, and strong against Electric, Flying and Steel Pokemon. Many Trainers have been using high CP/dmg counter this Beast, but who knew that Cubones can defeat Raikou?
“Cubone is a small, bipedal Pokémon with a golden brown hide that covers most of its body, including both dorsal spikes. Its belly is a very light brown. Two small claws, one on each hand, serve as its thumbs, and one large nail on each foot make up its toes. On its head, Cubone wears the skull of its dead mother as a helmet. Because of this, much of its actual face has never been seen, except for its triangular, black eyes and a small area surrounding them. The skull has two rounded horns on the top of its head and a tooth-like point on the lower sides. Under the skull, Cubone has a brown snout. The small Cubone survives only through the immense skill it possesses in wielding the bone it carries as a weapon.” as explained on Bulbapedia.
October 22, Sunday is the day when 19 players from Taiwan Lvl 30+ have challenged and defeated Raikou by using only Cubones (Max Cp 704) and 80 seconds left. So, it seems like the “Lonely” Ground Type Pokemon is useful in Raid Battles against Legendary Pokemon. :)