[RMMZ] HOW DO I MAKE A BATTLE SYSTEM LIKE MANA KHEMIA?

Hey. So I'm making a game and I want the battle system to be like Mana Khemia but I don't know how to do that. So... could anyone tell me how? Oh, here is the sample of the battle system (both image & video).

https://gamefabrique.com/storage/screenshots/ps2/mana-khemia-alchemists-of-al-revis-15.png

https://www.youtube.com/watch?v=nXA6_qQa5ZM