Replica Teams are an easy way to get wins in Pokémon Champions if you're not getting the hang of things. These are pre-made teams that you can use to build your own lineup. Not only can you use teams of other community members, but this can also include pro players from the VGC scene.
The first 24 hours have already sprung up some great Replica Teams to use.
Head to the Train section from the home screen, and you'll find the section to use Replica team. You can use the teams listed here by entering the correct code. Once done, you'll need to save the squad to an empty slot.
Screenshot by Destructoid
Here's the catch: you'll need to own the Pokémon and the correct held items. If you have a missing item, you'll need to purchase it. If you have a missing Pokémon, you'll have to get lucky with Recruit or seek an alternative. If your chosen Pokémon has different moves, you can always train them to change their moveset.