If you have the money to buy iPhone 14 Pro Max, it's going to give you everything you need when it comes to supporting your gaming needs. I'm using iPhone 13 Pro Max and it's very good too.
Once a smartphone have at least 6GB RAM and 128GB internal memory, it's going to be good to play more mobile games. It's the specification of my current android phone and it plays all my games.
I have a phone with a space of 4gb Ram and 128gb internal storage. I have been using it to play and it hasn't disappoint. Redmi 13 is a very nice phone and it's battery capacity is also recommendable for mobile gaming.