If you are revisiting Unova, here is what makes this version a must-play:

Before you can install the Pokémon White 2 CIA, your 3DS must be equipped to handle custom software.

This guide explores the significance of Pokémon White 2, how CIA files function on the 3DS, and the best practices for getting the game running on your handheld. Why Pokémon White 2 is a Must-Play

This comprehensive guide will explain everything you need to know about playing Pokémon White 2 on a 3DS system via CIA files, forwarders, and custom software. Understanding Nintendo DS Games on the 3DS

In short, the safest and most legally defensible path is to create your own game backups from cartridges you own.

A massive variety of Pokémon available right from the first route, combining older generations with Unova favorites. If you want to fine-tune your setup, let me know: