Because BL is technically a tier you could play (in a custom game) it wouldn't make sense because you wouldnt be able to use the mon that mega evolves in the first place, as it would be banned to OU. Also it really doesn't make a difference as there is no *official* playable BL tier.Shouldn't megas that are "OU by technicality" be BL instead? Doesn't really change anything, but it makes more sense to me.
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