Let's play the assumption game for a second.
Assuming these enemies are based on/inspired by actual Nintendo enemies, with a list somewhat like this:
Roader - Wheelie (Kirby), [[Mag Roader (FF6) OMG KEFKA CONFIRMED!!!1]]
Bytan - Electrode (Pokemon)
Trowlon - that thing in Wet-Dry World throws you around?(Super Mario 64)
Shaydas - shadowy-type enemies from Zelda (such as Puppet Ganon from Wind Waker), other Zelda enemies with this same type of "weak spot", Scyther (Pokemon)
Auroros - Skree/Metaree (Metroid), Fearow (Pokemon)
R.O.B. Squad - hurrr i dunno
What, then, are Greap (which looks like a Battlebot) and, my personal favorite, Poppants, based on?
EDIT:
omg poppants based on eddie (flip top) from megaman megaman confirmed!!!@
omg greap = tonberry + mario kart more final fantasy confimattion!!!!