Until we know more about them, I don't have anything to say other than speculation. Even if it's the best possible situation (of them being like 200 BP), they still take an item slot and are one time use. People will find a niche for them, just like how Gems in Gen V were used to cripple things that would normally be able to somewhat safely switch in on the Poke you use them on. It isn't much, but it's something.
>>28451953>Pikachu only doing little more than halfI mean, what did you expect? It's a non-Light Ball Pikachu that probably doesn't even have EVs. Heck, assuming none of those Pokemon had EVs, that's about how much damage Z-Moves would do if they're 180-200 BP