[MZ] PMZ — Pokémon Engine & Dev Kit for RPG Maker MZ (v0.9.14)

PMZ (Pokémon Engine for RPG Maker MZ).

General Engine Features:
The entire GBA generation, with their respective moves, abilities, and Pokémon (386).
EV/IV, nature, gender, breeding with egg moves, and inheritance.
163 items, 50 TMs, Pokédex.
Trainers, Gym Leaders, and wild Pokémon.
PMZ Editor — a visual editor for all content, opens in the browser (controlled access).
Single, double, AI, status, and animation battles.

It can also be found in:

Specific new features in version v0.9.14.4:
Improved general interface (menus, party, PC), smoother battle animations, fixes for movement errors, and fixes for interface and icon issues.

I tried opening the rmzproject file in RPG Maker MZ but it didn’t work out properly. It said that it couldn’t find plugins.js

That’s strange, are you sure you downloaded the entire folder correctly?