Awevil appears as an elderly figure with gray skin, slit-pupil yellow eyes with black sclerae, long red beard and a gourd-shaped head with small horns. The kanji kyou (凶, "bad luck") is written on his forehead. He wears black and white priest robes, as well as straw sandals (zori). He carries a gnarled wooden staff and sits bow-legged on a floating purple zabuton.
As his name and Medallium Entry implies, he is incredibly evil, just for the sake of it.
In the Springdale Sewers, activate all 3 switches, the last of which is behind a Rank S Watch Lock, to raise the floodgate in the middle of the area. Behind you will find Awevil, who can be challenged once a day until he's befriended through normal methods.
Yo-kai Watch 2
Awevil can be encountered in a similar manner to how he appeared in the first game, though instead of levers found throughout the Springdale Sewers, here it is through three card keys that you'll need to collect and use at the floodgate in the middle of the Springdale Sewers.
The Blue Card can be found in a chest on the Springdale business tower's 4th floor, which can be unlocked via a Baffle Board outside the building (you'll need to befriend an Illoo to activate this Baffle Board).
The Gold Card is acquired after completing "The Secret Base" Request that is activated by talking to Alex near the sewer entrance in Breezy Hills.
The Red Card is given to you by the leader of the Sesame Club in the sewers, whose members are scattered throughout the sewers. You'll need to speak with all 10 of them by utilizing the various sewer entrances around Springdale to speak with them from behind their doors. Once you speak with all 10, speak with the leader to acquire the Red Card.
Once you have all three, you can use them at the main floodgate in the middle of the sewers. Once all three are used, Awevil will appear, where you can battle him once per day until he's befriended through normal methods.
Yo-kai Watch Busters
Awevil can be freed from the Crank-a-kai with his own Boost coins, which can be found by reading QR codes, every time you don't free him, using one, the chance of getting him with the Boost Coin rises.
Yo-kai Watch 3
Awevil is obtained through the quest "Woe to Sleep Under the Ground", you need to beat the game and have the S rank watch to take the quest however. Upon taking it, Awevil can be found under a hidden manhole in Downtown Springdale, if you win against him he will be an auto-befriend.
Awevil can be freed from the Crank-a-kai with a Blue coin or a Blue Coin G
Yo-kai Watch: Wibble Wobble
In the Japanese version, PuniPuni, Awevil, along with Black Komasan, and Black Jibanyan, can be freed from the Black Crank-a-kai with 4500 Y money in the Kuroi Watch event.
Bomb (Puts a bomb down that will explode by time. Does massive damage)
His Japanese name, "Yamimaro", is a combination of "darkness" (Japanese: 闇,Yami), and "maro" (Japanese: 麿,"maro"), an old-fashioned ending for male names.
His English name, "Awevil", is derived from the phrase "all evil".
His Spanish name, " Diablés" is a corruption of "Diablo" (Devil).
Awevil, like Greesel, is based in the youkai Nurarihyon, said to be the leader of the Hyakki Yakou (Hundred Demon Night Parade). In the original tales, he is described as an old man with an elongated head, wearing fine clothes or the garbs of a head priest. He'll infiltrate mansions at dusk, while everyone is busy finishing up on chores for the day, and sit down in one of the rooms pretending to be the lord of the house: he will smoke the master's pipe, drink tea and sample the expensive food, bark orders at the servants and generally make himself at home. Sometimes he'll even dress up like a wealthy merchant and walk around town, or visit red light districts and mountain villas escorted by his youkai underlings. In Shigeru Mizuki's GeGeGe no Kitarou, Nurarihyon is one of the recurring antagonists of the series.