How do I make a turn based combat system similar to Pokemon?
Make gamelogic that is turn based.
There is nothing really special about it, just have a GameMode that is able to have turns.
Then you need to define what starts/ends a turn and execute it in order.
If it’s a PVE game it basically should be
Your turn → Action that ends Turn → Ai turn → Action that ends Turn
As far as I know there is no special premade turn based system available in unreal, you will have to do it yourself.