Alolan Muk - Muk is a great fit for Mutantstick but I feel like Alolan Muk makes more sense since it's a lot more colorful than regular Muk. They also both have no bones unless you count the rocks in it.
Goodra - They're both big and friendly, and of course, both covered in slime. They also both love hugs.
Ribombee - Not only do they have a very similar face, Mutantstick also has a love for bugs!
Quagsire - Quagsires unaware matches Stickmutants IQ, and I'm pretty sure they would have the same IQ regardless of abilty.
Xurkitree - Skrunkly
Galarian Slowbro - Getting your hand stuck in something and somehow evolving from it is something I feel that represents Stickmutant almost perfectly
Bomb strapped to stickmutants chest - IT'S GONNA EXPLODE IN 3 SECONDS
