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Out of curiosity I ran some calcs on future legendaries / mythicals and it seems "I defeat you by singing" the pokemon would actually end up being quite decent and not just a worse Mewtwo.
Thing is, it's got quite a few losses
>Tyranitar (who is so far out of the meta it doesn't matter)
>Metagross, Dialga (No outplaying these.)
>Reshiram, Zekrom (Same)
>Kyogre (although the 0 and 2 shield scenarios are more favourable)
Close losses against Heatran and Melmetal.