[Question] Field Effects new abilities

Hello, people, I'm brazilian, so sorry for my poor english, but I am working in some ideas and hope the community can help me. I want create abilities to set Tailwind, Trick Room and Gravity on the batlefield. I really messed up a lot of projects trying to do it. Please someone can give-me a hand?

So you've looked at other abilities that trigger when switching in like Drought, and you've looked at the code for those moves? Can you post the code you've written based on those bits of code and explain why you wrote it like you did? I imagine it should be pretty easy to correct your mistakes.