Well this was, um, disappointing. These things aren't nearly as good as if they had just released Soul Dew, I'm honestly really questioning their viability at all.
I mean, MLatias takes hits marginally worse on the special side than old Soul Dew Lati did, and it's definitely not gonna be earth-shattering enough offensively to use over something like Kangaskhan-M or MY/MX. Neither is MLatios, for that matter. However, DD Latios will be fun to troll the lower ladder with y/y.
I mean, no differenciating type changes (Dragon / Fairy would have been awesome. Dragon / Steel could have possibly made sense since they're jets, etc.), they both keep Levitate over something bad-ass like Adaptability / Speed Boost / Multiscale that would have made sense, and their Attack boosts are basically irrelevant considering they're still gonna be primarily special attackers.
All in all, to extract a quote from the thread
lol mega latias is fucking garb.