Originally Posted by Fat Wizarus
That doesn't really work in practice. A seasoned player should always know something like that is up when Tornadus doesn't have weather support.
Beside that, any team should have a Tornadus counter and since no weather includer can counter it, there will be another mon in their team to do this job. Also people are aware that even though they have their own weather include it isn't guaranteed their weather is actually up so they have a way to defeat Tornadus if rain should be on the battlefield.