In Pokemon GO, how do I control the evolution of Gloom, Poliwhirl, and Slowpoke?

Question

Please don't question my curiosity.

Answer 1

There is 2 buttons,one for the gen 1s and one for the gen2s but the gen 2s also need a special item from pokestops
The items: Dragon Scale, King's Rock, Metal Coat, Sun Stone, and Up-Grade
Source: https://www.primagames.com/games/pokemon-go/tips/pokemon-go-how-get-special-items-evolve-metal-coat-rarity

Comments

What is the item called?

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for which pokemon?

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Bellossom (12 characters)

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Sun Stone, just like in the games.

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Actually, its the Sun stone and 100 candies