When I used to use latios, I used him as a lure for tyranitar. I aim to cripple that pokemon as much as possible so that it will eventually die from hazards and the constant switching games it has to play with Ninetales. That being said, LO Latios was able to pull his own wieght once I realized that specs just wasn't worth the trouble. I haven't been running him recently though.
Ninetales vs. Sand is a problem mainly for landorus. Gliscor is not taking hits from offensive Ninetales (Gliscor is not taking hits from defensive Ninetales either when sun is up, but eh...). Landorus outspeeding you by one point and forcing you to switch is the biggest issue. And if he u-turns, you wind up having your EQ answer being faced with a scizor/rotom-W.
I haven't been bothered by Heatran for quite some time. I usually run something on my team that gives him trouble these days, like gastrodon, infernape, etc.
My sun teams usually go like this: 2 fire types, 1 grass type, 1-2 steels. The last spots are whatever I need them to be for general utility.
"It's time to try our new secret weapoon!"
Infernape @ Life orb
Trait: Blaze
Nature: Naive
Evs: 44 Atk, 212 spA, 252 spd
-Nasty Plot
-Fire Blast
-Close combat
-Vacuum Wave/Grass Knot
I'm not gonna bother drawling on about it's utility. Here are some calcs.
+2 LO Fire blast vs. 252/0 Rotom-W(sunlight): 97.7% - 115.5%
No sunlight: 65.5% - 77%
+2 LO Fire blast vs. 248/0 Jellicient (sunlight): 74.9% - 88.3%
+2 LO Grass Knot vs. 248/0 Jellicient (no sunlight): 111.7% - 131.5%
+2 Lo fire blast vs. 156/0 Gyarados (sunlight): 85.1% - 100.3%
+2 LO grass knot vs. 156/0 gyarados: 75.9% - 89.5%
+2 LO fire blast vs. 248/8 gyarados(sunlight): 79.4% - 93.6%
+2 LO Grass knot vs. 248/8 gyarados: 70.7% - 83.5%
+2 LO fire blast vs. 252/0 Dragonite (sunlight): 81.6% - 96.1% (not factoring in multiscale)
+2 LO fire blast vs. 252/252 careful dragonite(sunlight): 58.8% - 69.2% (only thing so far that lives after rocks)
+2 LO fire blast vs. 252/0 Tentacruel(sunlight): 73.9% - 87.1%
+2 Lo fire blast vs. 252/136 Calm Tentacruel(sunlight): 59.9% - 70.6%
+2 LO fire blast vs. 252/0 Vaporeon(sunlight): 70.6% - 82.9%
+2 LO fire blast vs. 252/0 Slowbro(sunlight): 95.7% - 112.7%
+2 Lo fire blast vs. 0/0 Naive salamence(sunlight): 127.8% - 150.5%
+2 LO fire blast vs. 0/0 Naive salamence(no sun): 85.2% - 100.6%
+2 LO Fire blast vs. 4/0 haxorus (sunlight): 143.9% - 169.4%
No sunlight: 95.9% - 113.3%
+2 LO fire blast vs. 4/0 hydriegon(sunlight): 105.8% - 124.5%
+2 LO Vacuum Wave vs. 4/0 hydreigon: 94.5% - 112.3% (Less damage than fire blast)
+2 LO fire blast vs. 252/0 Suicune(sunlight): 81.9% - 96.5%
+2 Lo grass knot vs. 252/0 suicune: 121.6% - 143.3%
LO Fire blast vs. +1 252/0 Cosmic Power Sigilyph(sunlight): 88.1% - 103.8%
LO fire blast vs. 252/0 reuniclus(sunlight): 99.7% - 117.7%
+2 LO Vacuum Wave vs. Excadrill: 88.4% - 105%
For the hell of it:
+2 LO fire blast vs. 252/0 Latias:(sunlight) 69.2% - 81.6%
+2 LO fire blast vs. 4/0 Latios(sunlight): 96.3% - 113.6%
This pokemon is your sweeper, late game cleaner, LO beater, late game cleaner, death machine, late game cleaner, tyranitar/heatran answer, and late game cleaner. You send this guy out midway through the match when most of your opponent's pokemon have taken prior damage from hazards and you set up. Crush them. Eat them. You will like it. I assure you. I gave you calculations on a bunch of bulky pokemon who resist Infernape and most of them are ohko'd with stealth rocks up or are 2HKO'd. The ones that are 2HKO'd lack the ability to ohko Infernape back. Partner him up with a pursuiter to get rid of Starmie and Lati@s and you're pretty much home free. With encore working the way it should now, you can even use him alongside wobbufett.