I know that to get challenge mode, you have to beat the game. Do I have to start the whole game again to use the challenge mode or can you just use it from then on.
You can only use it after you receive it. After you start the game over, challenge mode disappears.
How to change your username
How to add a user avatar
Why was my post hidden?
Flags vs Downvotes
Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.