>>30863943Water/Fire: Pistol Shrimp pokemon (retcon Clauncher)
Grass/Fire: Either a chili pepper line or a burning tree/forest fire line.
Ice/Electric: Aurora pokemon (you do ont want to fly through the Aurora Borealis.)
Poison/Normal: Platypus maybe, with only the males being poison type?
Bug/Normal: Someone had an idea of a bear that forms a symbiotic relationship with a beehive that I thought was neat.
Bug/Ice: Seconding
>>30864787 wolly bear idea.
Bug/Psychic: Luna Moth, or other moth that uses it's eyespots to hypnotize and confuse others. Potentially also bug/ghost if you want to expand that typing.
Rock/Normal: Should be Rockruff's line, desu.
Rock/Poison: Radioactive mineral pokemon, perhaps a variant of the Roggenrola line found near power plants?
Ghost/Normal: Again,
>>30864787 hit the nail on the head.
Ghost/Fight: Literal shadow boxer.
Ghost/Rock: A ghost that carries it's tombstone with it, and uses it as a weapon.
Dragon/Bug: Retcon Vibrava/Flygon.
Steel/Normal: A Normal rat pokemon that collects junk, evolves into steel/normal wearing a cobbled together suit of armor.
Steel/Poison: Mercury pokemon.
Dark/Electric: Honestly I think Xurkitree would fit this typing.
Dark/Bug: Some kind of particularly vicious insect; a weta, perhaps.
Fairy/Fire: Soot sprite.
Fairy/Ground: Gnomes.
Fairy/Dark: Goblin, or some other clasically unseelie fey.