Looks like they're version-exclusive. The text in the corners of the next two leaked images says "Sun Exclusive Evolution" (サン限定進化) and "Moon Exclusive Evolution" (ムーン限定進化).
Another blurb states:
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イワンコがルガルガンに進化するときに太陽や月のエネルギーが必要らしい。太陽と月といえは、あの伝説のポ ケモンがいるが…！？
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Quote:
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For Rockruff to evolve into Lugarugan, it seems essential for it to sometimes be exposed to energy from the sun or moon. Speaking of the sun and moon, there's that legendary Pokémon...
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