how about Heatias? Heatran and Latias have perfect synergy. Latias take water, fughting, and ground for Heatran, while Heatran takes bug, dark, ghost, dragon, and ice. The only real counter to this is Tyranitar with it's massive sp def in sandstorm. Because the two are specially inclined, any special wall will counter, though they should fear a roar from both pokemon.
Latias @ leftovers
Timid, Levitate
252 HP, 4 Sp Atk, 252 Spe
substitute/HP fire
dragon pulse
recover
calm mind
heatran @ air balloon
timid, flash fire
252 Sp Atk, 4 Sp Def, 252 Spe
fire blast
roar/SR
earth power
HP ice
Latias @ leftovers
Timid, Levitate
252 HP, 4 Sp Atk, 252 Spe
substitute/HP fire
dragon pulse
recover
calm mind
heatran @ air balloon
timid, flash fire
252 Sp Atk, 4 Sp Def, 252 Spe
fire blast
roar/SR
earth power
HP ice