Seadras need a dragon scale to evolve.

One of the new features introduced recently to Pokemon Go are evolution items. These five additions help you evolve some Gen 1 and Gen 2 Pokemon when combined with a certain amount of candy. Here's everything you need to know about these items and where to find them.

Before Gen 2 was released, all you needed to evolve a pocket monster was collect enough candies. Now, for some special Pokemon, you need to collect the candies and an evolution item.

Here are the evolution items and how to identify them:

The taser-like upgrade item you need to evolve Porygon.

Right now, only eight Pokemon evolve using anything other than candy. Here's a list and what you need to evolve them:

To evolve Onix you need a metal coat.

There are two different ways to evolve a Slowpoke.

The only way to get evolution items is by spinning PokeStops. Like with the new berries, though, they don't drop as often as balls and razz berries. After more than fifty spins at various stops, I only got one sun stone. Your mileage may vary, but don't expect to collect them quickly.

There's a rumor that you're more likely to get an evolution item when you get your seven-day streak bonus, but that hasn't been confirmed.

The one sun stone I found after more than 50 spins.

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Everything you need to know about evolution items in Pokemon Go - CNET