You have to at least submit your teams, if you don't you don't win, but submitting any team and not winning still counts, but it has been a long time since I actually managed to lose every single game, so it might have changed.
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In tournaments you have to win or draw 1 game to be eligible for rewards.
If you lose all your games you get nothing.
In brawls if you put matches in you get sps even if you lose all your games.