PokéBase - Pokémon Q&A
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The only way is to migrate from X/Y, or to catch Greninja in Poni island using island scan, however there's no guarantee it'll have Protean. You can fine hidden ability Pokemon in friend safaris.

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That sucks...
What about island scans?
Oh I forgot you can catch Greninja in Poni Island using island scan.
I'm pretty sure Pokémon from Island Scan never have their HAs, making it impossible to find in Gen 7 alone.