> People are asking where does it states that Alola will have more than four captains.

Here's the screenshot and links of the official japanese site.
http://www.pokemon.co.jp/ex/sun_moon/story/160801_01.html

"キャプテンは4人以外にも、まだまだいるぞ!" more specifically

Thought, people are saying this is for Kahunas.

¤ + 4 more than 4 Captains
> Gumshoos' trials is set on a cave. None of the already shown trials are set on a cave. Both are Normal Type, which might indicates a Normal Type trial
> Kiawe and Mallow have trials on the same island (Akele), with today's trailer, Lana appears to also have it.

¤ - 4 more than 4 captains
> There is no life signal of anyone until now
> 4 islands, 4 trials, 4 kahunas
> Only the 4 appears on the trailer
> They match the four main merchan types of the franchise, no need of more

Which team are you, /vp/?