Slimamander appears only as a boss in the first Yo-kai Watch. In later games, he can be befriended.

The very first boss encountered. Was imprisoned with seals surrounding Springsdale.

Despite loving the baths at the hot springs, Sproink's elemental weakness is water.

Sproink is a Boss Yo-kai that likes to hang out at this location.

Snaggerjag can summon 1 of 3 fish allies that can either deal elemental damage, physical damage or heal.

Attacking Massiface's eyes greatly lowers his accuracy.

Phantasmurai itself is actually piloted by a small mouse Yo-kai.

Attacking its legs will cause Tarantutor to drop to the floor, revealing the weak spot on its abdomen.

Both in life and as a Yo-kai, Dr. Maddiman worked to create the Yo-kai that would protect his family and take over the world.

Chairman McKraken never saw humans and Yo-kai as equals. He thinks Yo-kai should rule over humans.

Gargaros isn't meant to be fought until much later in the game. Until then, running is the best option.