Pixelmon is a popular mod based on Forge originally created in 2014 for Minecraft: Java Edition that recreates the Pokèmon series in-game, you'll find seventh generations of Pokèmons around the world in different biomes and you'll be able to catch, tame, train and fight them. Like the original game, you can visit shops, gyms, pokèmon centers, make recipes and defeat bosses! The mod is obviously heavier than the vanilla game so you'll need atleast 2GB of RAM to run it properly, you can download the mod on the Technic or ATLauncher.