I can see something like Water/Fire if it's a steam/geyser Pokemon.
Fire/Normal is silly. Almost as silly as Psychic/Normal (Girafarig).
Fire/Poison could work if they do some kind of Factory Fumes Pokemon.
Grass/Fire? I don't think so. Unless it's a WildFire evolution (like giving a grass weed/twig pokemon a Fire Stone or something).
Fire/Ice? nahhhh.
Interesting bit of news there.
What they should do is add more to Far Rockaw---errr "Undella Bay" (it's based on Jamaica Bay haha... Long Island).
I'm from the NJ/NY area, so this game is particularly fun.
It's pretty cool that you start the game basically in LowerBound Brooklyn, and Driftveil City is basically either Union City, or Newark Bay Harbor (complete with the giant shipping containers), which is in my neck of the woods.
Nimbasa City is basically Madison Square Garden and Herald Square, what with its sports domes & whatnot.
Mistralton City has a small freight airport which corresponds to Teterboro Airport in NJ.
I used to WORK NEAR THERE! XD
Icirrus City is full of marshlands so it's probably Bergen County somewhere. Looks too nice to be Secaucus (actual wetlands of NJ) so it's probably something like Ridgefield Park or something.
Tubeline Bridge looks as if a train ran across the center of the George Washington Bridge from NJ to NY.
Basically I'm fond of most of West Unova 'cuz it totally looks like places I've been to.