pokemon-go
Clicking on my Player Avatar I can see various stats about my trainer, including one that says 'No Team', which appears greyed out. Clicking on it does nothing:
I also can't seem to add them to a team from the 'Pokemon' screen either (although I can favourite them).
How do I add Pokemon to my team?
As of version 0.31.0 you can now change your avatar's appearance by navigating to the new menu in your profile and tapping the "customize" option.
Borrowing from @Codestrife's answer here
The rustling leaves usually indicate that there are pokemon near that area. Going and walking around near that area gives you a higher chance to encounter Pokémon.
Keep an eye out for rustling leaves, hinting at where critters may be lurking and simply hang out in a suspected region for the increased chance of an encounter. - Source
Therefore, the reason you don't always see Pokémon in rustling grass is because there is only a higher chance to encounter them there and not a guaranteed chance of encountering them. You just have bad luck when you don't encounter them.
Best Answer
Source