>>21851529You can refight it after beating the elite four again at the top of sky pillar, where you get to see it's triangle form even.
No confirmation on whether it resets from its stats/shininess in the first battle, but I'd guess it does considering other legendaries have done so.
>>21851564I'd imagine all legendaries can be refought if killed by doing the usual "beat the elite four again," but I have no direct confirmation on that either.
