Tandemaus and Maushold

This generation's normal-type rodent has the unique gimmick of being a "mated pair;" two nearly identical Pokemon acting like one. Their designs are incredibly plain, too, but that seems to be the whole point; they resemble pure white "dolls" of ultra-simplified cartoon mice, like Hello Kitty with Mickey ears, simple black dots for their eyes and noses. They even have markings to resemble "stitches" where their ears meet their head. They really grew on me once I caught this "unfinished toy" angle. One also has a grey cast to its lower torso and legs, like it's "wearing pants," with a round chunk "missing" from the grey area, a little like a puzzle piece. The other has this same greyish band hiked up like a "shirt," so that's cute, though the "shirt" marking totally ought to have had an extra spot on it that'd "fit into" the "pants" of its partner, right? The other puzzle piece?

One of the funniest things about these mice is their attack animation, where their mouths suddenly gape startlingly wide and chomp down with their buckteeth. It's intentionally "creepy" looking, with a pinkish throat and tongue visible, even a pinkish blush effect between their eyes to make them look more worked up.

But the VERY funniest thing about these mice is their "evolution" into "Maushold," where absolutely nothing changes about the original two mice, but they randomly add either one or two little babies to fight with them. This occurs only if Tandemaus level up during battle, and can even happen without playing an evolution animation. One minute you have two creepy mice, the next they've popped out a baby or two while you weren't looking. There's no mechanical difference, but the single-child family is significantly more rare, with only a 1/100 chance.

I find these little freaks fairly entertaining, eerie funko pop hello kitty dolls that multiply when you aren't looking and will bite chunks out of you if you threaten them. The only question is what exactly allows multiple Pokemon to function as just one, even using the same pokeball, but that's a question we've had ever since Exeggcute, Magneton, Dugtrio and Slowbro. It's just another of those weird Pokemon Energy phenomena, I guess. The pokedex says "nobody knows" where "the little ones" come from and that Maushold "might" be a family of related Pokemon, because no one in the Pokemon world has ever had the talk I guess.