Steel/Dragon- heck, super Tank especially with Levitate. with that, the only way it has SE move against it is with Gravity/Mold Breaker, and fighting moves(Steel removes Dragon/Ice Weak, then is immune to poison/Ground)
Fire/Water- hence the name, and it would be pretty cool. removes the Water and Grass SE moves, only is weak to electric/ground/Rock, and has only 2 weaks with levitate as well
Poision/Electric-Psychic/Ground only weaks, still is an interesting combo though
Dark/Electric- looks cool, thought Luxray should have been this
Grass/Steel- one weakness, with heatproof- it has none....
Dark/Fighting-....really noticable, only weak is flying i think
Farfech'd needs an evo- mabey Fight/Flying?
Butterfree needs Bug/Psychic typing as well....lol