신오의 돌 - Evolution Item
신오지방에서 처음 발견된 특정 포켓몬을 진화시키는 특별한 돌. 아주 견고하고 아름답게 빛난다.
Special evolution items like the 신오의 돌 first arrived back with the second generation of Pokémon, and are now required when evolving Pokémon such as 내룸벨트 and 거대코뿌리 and 덩쿠림보 and 에레키블 and 마그마번 and 토게키스 and 겟핸보숭 and 메가자리 and 돈크로우 and 무우마직 and 글라이온 and 포푸니라 and 맘모꾸리 and 폴리곤Z and 엘레이드 and 로즈레이드 and 야느와르몽 and 눈여아. When evolving these Pokémon, this item is required in addition to the candy, and is consumed when used.
How to get the 신오의 돌

The 신오의 돌 is obtained from spinning Pokestops and Gyms. There is a very low drop chance of around 1% per spin to receive a 신오의 돌 or any of the other evolution item, and there is an equal chance of obtaining each of the 5 currently available items.
There's no way to ensure that the 신오의 돌 will drop, but with only 4 other items, there's a greater than 50% chance that you'll receive one once you've spun over 250 Pokéstops.
The 7th day streak bonus gives you a very high chance of obtaining one of the evolution item, but it's not believed to be guaranteed.
Other evolution items
The other evolution items that can be found in Pokemon GO are: