Doesn't work the way you might hope. Pokemon of this type would hardly ever be used, but everything would use attacks of this type. Like how Ice types are pretty bad in general and don't see much use, but Ice attacks are everywhere.
Unless you restricted attacks of this type to Pokemon that have it. But even then...
I'm probably giving way too much thought to this. --- I summoned a baby to attract a lion. It didn't seem to work, so I tried a delicious baby. Regular baby ATE delicious baby. Horror....horror.~Gameplayingperson
The ultimate sweeper... Just make it fast and strong and is does 4x SE damage on everything that's dual-typed.
Slap a Choice Band/Scarf/Specs on that sucker and destroy everything. It would be Uber. --- I'm not easily impressed; I'm usually oblivious to whatever's in front of me. Stunfisk is the epitome of monstrous majestic legendary creatures that spew fire.