poor movepool? it's movepool is anything but poor. what hinders it from being offensively inclined is its stats, not its movepool.
choice specs ice beam and shadow ball from special sweepers, although not OHKOing it, damages it just as much as ubers would be damaged from their weaknesses. again, pointing out the fact that it becomes vulnerable to things that are specifically meant to counter it is not disregarding the fact that it is able to endure more opposition with a focus on defense rather sp def. using hippowdon as an example is just disheartening because it performs entirely different than latias: 1. it's a physical wall that can actually be called a wall. 2. it has only one significant resistance and several common weaknesses and 3. it doesn't have a speed that gives it an advantage over its potential counters.
again, you're mentioning metagross and ttar who obviously wall it, attempting not to shed light on the fact that they are few who can safely approach it. and again, i'm not discussing moves themselves. i'm discussing items and ev spreads. the main point is that it has 110 base speed, allowing it to dismantle choice item users with inferior speed. wanna know why cresselia wasn't placed into ubers? its speed and mediocre movepool. latias has both of these qualities at its arsenal, forcing counters who can give it good damage to decrease their damage output if they want to actually hit it or decrease their survivability (because of having to invest in speed and offenses). basically, CB Heracross would have to go near max speed when Adamant to do enough damage to it, setting the usual HP evs it has aside.
and i never tried to make the point that latias poses a death threat to it's counters. however, it can cause damage to them scouting, not being fearful of an OHKO and even further, can increase its defenses before they even reach the field. unlike cresselia, it has recycled usage after it has been severely damage when it reenters, requiring more than one counter for it.
so if you're asking whether teams take it as a force to be reckoned with when being built, they should. it's defenses AREN'T that great, but it doesn't die easily and has the ability to take several casualties when it does.
Its movepool may seem vast, but it doesn't do a good job countering the numerous things that are going to wall you. For example, Salamence gets Flamethrower/Fire Blast for Steels, while Lati@s has to settle for HP Fire. The loss of Shadow Ball doesn't hurt it either considering that the most common counters to it - Blissey, Tyranitar, resist or are immune to it, and inferior to its other options for damaging Metagross. Gengar and Mismagius likewise can be hit with about the same power with Dragon Pulse; higher with Draco Meteor, and they won't be switching into Lati@s anytime soon. The point that I am trying to bring across is that Lati@s has an inferior movepool which allows it to get walled by several common pokemon, and that an offensive set is generally outclassed by Salamence due to Flamethrower.
Ubers is a vastly different metagame from standard, it is more offense oriented and Latias is used as a special tank instead of a sweeper, about the same with Latios.
Okay, the counters being severely hindered by Lati@s higher base speed is not a good example, mainly because without speed investment Lati@s' base speed is a paltry 256, only enough to outrun base 77 252 neutral sweepers. What is more important is that its counters don't usually run speed - in Ttar's case about ~80 at max to outrun Skarm, in Meta its not required.
I was quoting Ttar and Metagross being its main counters in Ubers - even with the Soul Dew boost. I don't know its real counters in the standard metagame due to the differences in the Uber metagame and Standard.
Attempting to think of a list of counters:
Toxic/Twave Blissey (Lati@s without Refresh/Safeguard)
Crunch Snorlax
Registeel
Bronzong
CM Jirachi
Heatran
Magnezone?
Empoleon?
Scizor?
Oh I just listed out almost every steel in the game that has decent Special Defence.
Cresselia was not placed into Ubers because of its
TYPING, which gives it unfortunate weaknesses, and the lack of a reliable recovery move besides Rest.
Latias also has the Psychic type, in addition it has the Dragon Type, so it can't wall Dragon special sweepers, mainly Salamence, and Ice Beam hurts a lot. Latias has a reliable recovery move but has crappier defenses than Cresselia, in addition to being unable to counter certain threats effectively.
CBHera is not a counter to Lati@s due to the low speed and possibility of being KOed by their attacks. Therefore CBHera should not be brought in to revenge kill Lati@s.
It fears OHKOs from many common pokemon if it has not invested heavily in defences, it can scout but it would just be
pursuited by one of its counters.
Teams should prepare for it the same way they prepare for SpecsMence, unlike Lati@s it can switch in on stuff like Heracross because of Intimidate, and it truly fits the definition of a pokemon that can come back and deal damage.
Garchomp is also another example to quote, simply put it can switch in on Electric attacks taking minimal damage from SR and threatening with its base 102 speed.
Okay, I'm just going to run some general damage calculations with
Sweeper Latios. (4 HP, 252 SpA, 252 Speed Timid)
Special Defensive Tyranitar - 240 HP/52 Atk/216 Sdef Careful
TyraniBoah - 252 HP/64 Attack/168 SpA/24 Spe
CB Max Attack Tyranitar Crunch on Latios - 175.4967% - 207.2848% (OHKO)
CB Max Attack Tyranitar Pursuit on Latios - 88.07947% - 103.9735% (2HKO, potential OHKO)
CB Max Attack Tyranitar Pursuit on
Fleeing Latios - 175.4967% - 207.2848% (OHKO)
CB
Special Defensive Tyranitar Crunch on Latios - 137.7483% - 162.9139% (OHKO)
CB
Special Defensive Tyranitar Pursuit on Latios - 69.53642% - 82.11921% (2HKO)
CB
Special Defensive Tyranitar Pursuit on
Fleeing Latios - 137.7483% - 162.9139% (OHKO)
Jolly Tyranitar (Max Attack) Crunch on Latios - 105.9603% - 125.8278% (OHKO)
Quiet
TyraniBoah Crunch on Latios - 93.37748% - 109.9338% (Potential OHKO)
Next, Metagross.
RestTalk Gross - 176 Attack
CB Max Attack Metagross Meteor Mash on Latios - 110.2649% - 130.1325% (OHKO)
CB Max Attack Metagross Pursuit on Latios - 59.60265% - 70.19868% (2HKO)
CB Max Attack Metagross Pursuit on
Fleeing Latios - 117.8808% - 139.0728% (OHKO)
Max Attack LO Agiligross Meteor Mash on Latios - 95.36424% - 112.5828% (Potential OHKO)
RestTalk Gross Meteor Mash on Latios - 69.86755% - 82.78146% (2HKO)
Bronzong:
Standard Bronzong - 252 HP/152 Attack/8 Def/96 SpD, Relaxed, 0 Speed IV
Standard Bronzong Gyro Ball on Latios - 63.90728% - 75.49669% (2HKO)
I'll try to do the rest of the calculations later, but these three pose a threat to Lati@s due to their ability to shrug off most of its attacks.