Gargaros in Yo-kai Watch 2

Gargaros can no longer be fought in Terror Time as the oni bat the player away when approached. He however can be killed with items and will drop a large Oni Orb. He however still appears as a boss in the Irate Eight boss rush in Springdale Sports Club which is unlocked after beating Kat Kraydel.

Gargaros' appearance when changing the system time now also affects daily occurrences like putting money into the box at Mount Wildwood Shrine. Disallowing it for two real world days.

Gargaros can be befriended in Bony Spirits Way, in any version of the game, but you must have the 2.0 Oni Evolution Update and both Psychic Specters and Bony Spirits versions of the game. If you're playing Bony Spirits or Psychic Spectres, simply link both versions of the game and get the Spooky Key, Butterfly Key and Boar Key from Mr E outside of the Abandoned House in San Fantastico (location which becomes available by train during chapter 6). If you're playing Fleshy Souls, link with Bony Spirits and talk to Mr E, who will just give you the Spooky Key. Save, and then link with Psychic Spectres, which will make Mr E give you all 3 remaining keys.

Around halfway through the normal Mystery Way dungeon you will reach a room named Mystery Way - Ramp, where you should see an Eyepo, an Ignoculus, and up to 3 doors that will be unlocked when you've linked together the various versions of Yo-kai Watch 2.

Go through the door guarded by Arachnus to Bony Spirits Way. When you enter, you will step into Fullface Rock. Check the minimap to see the purple Yo-kai icon, and use the vine to climb that rock to find Gargaros. Because he is a boss, he does not accept food, and it's uncertain whether the popularity Skill or Superstar Soul increase his befriend chances at all. After the battle, he will not walk up to you like regular Yo-kai do; instead, his post-battle dialgue will change to indicate that you've impressed him, and give you his medal when he finishes talking. Like other 2.0 Yo-kai, he can't be used in Psychic Blasters.

Version exclusive: Yo-kai Watch 2 Psychic Specters.