Even in suspect battles in which Latias wasn't a member on either player's team, both teams still had to prepare for the possibility of facing it, and so I think those battles are still relevant. Like previously stated, if Latias' mere presence on the ladder forces people to change their teams to the extent in which they are far more open to being swept by other pokemon, then there's an argument for
"the threat of Latias sets up a situation in which it makes it substantially easier for other pokemon to sweep", and this is one of the support characteristics for uber.
And if we ever test a suspect in which next to no people use it on the suspect ladder, then I think that tells us a lot about the pokemon's status. If people can consistently win to voting eligibility without using a 'possibly uber' pokemon against teams that are using this 'possibly uber' pokemon, then chances are it is probably not uber.
It just occured to me that this may cause a slight bias to the voting.
You are adding voters from people that are using the suspect on their teams a lot. It seems to me that people that use the suspect are going to be more likely to vote uber. Surely an overwhelming majority of people who dont use the suspect during the test are going to vote OU at any rate.
Have a nice day.
If people are biased from having used a pokemon more, then surely it doesn't matter? The person who has used Latias the most will know it best - know what it is and is not capable of - and would therefore make the best informed decision about it. If the people who use it consistently are all biased towards OU or uber, then since they have the most experience with it and can be trusted to make the right decision based on this experience, it shouldn't matter where they are biased.