This thing doesn't even look like a Pokemon, yet it's got one of the most broken Abilities introduced in Sun and Moon. Don't underestimate this Water and Bug type.
The Water Bubble ability lowers the power of Fire moves and prevents Araquanid from getting burned. However, it has another special, hidden buff that the ability description fails to mention.
Water Bubble boosts Araquanid's Water STAB moves up to 2x power from the regular 1.5x. Even though Araquanid's Attack and Special Attack are nothing to brag about, its Water STAB is enough to blow Water-weak enemies out of the park.