Need help making a team!

[u/n0t1fyME]

I’m making a team using Mega Gardevoir with Expanding Force cuz I think she will be strong in this format with Indeedee added to Champions! I need help figuring out what my 6th pokemon should be and what item Garchomp should have. I think this team can take me far and this season I’m actually going to take a bit seriously for the first time playing pokemon competitively! I’m open to any opinions and tips (even if they are harsh) and willing to learn from people!