Someone did gen II Fire with Typhlosion and Houndoom last time. :( I'm trying to think of something new. So far...
Gen IV, Ice, Froslass and Abomasnow
Gen I, Fire, Flareon and Rapidiash
Gen II, Water, Politoed and Octillery
Gen III, Ghost, Banette and Dusclops
That's in order of which ones I wanna do more than the others. :(