Boa tarde, gostaria de saber como faço para criar pokestop e Ginásio ou se existe possibilidade de transformar uma pokestop em um ginásio.
Grato,
Welcome to the forum!
Niantic does not officially acknowledge the use of S2 cells in determining which Wayspots become Pokestops and gyms, but this article explains what the community has found: https://pokemongohub.net/post/article/comprehensive-guide-s2-cells-pokemon-go/
Hello and welcome @rafamarx
It’s great that you are asking questions 
Seeking advice to create a nomination that will stand the best chance of success is a good move.
If your main interest is submitting some specific places to appear in the game we can help check if what you are hoping for is possible.
Do check the information about what is acceptable
And this is a very good article about making a good nomination
If you want to tell us the area we will see what we can advise.
I will move this to nomination support to help that process.