Furia Model II-Y

An slight improvement over the standard Furia Model II, although this one has the resistances of its predecessor modified and scattered all over the place: it lost the Fire resistance and Paralysis resistance, but also got a resistance to Poison that makes it almost immune to said stat. As it appears during the boss battle with the Reyvaroid, you should just worry about them whenever they try to summon more monsters with their Stored Attack, and use them to rack Beat Ups to make Purging easier.

Trivia
As these monsters only show up during a boss battle, you won't able of getting any experience, Leaf or items from them, despite they having all of these rewards programmed into the game.