After defeating Marnie & Hop in the Semi-Finals, retrieving Leon from Rose Tower, and defeating Bede one more time, you will finally proceed to the Champion Cup Finals. In order to reach and challenge Leon for The Galar Region Champion, you must defeat three Gym Leaders in a tournament of battles. Your second Finals Opponent in Pokemon Sword will be Bea, who continues to specialize in using Fighting Type Pokemon. In this battle, she will use fix different Pokemon, all of which will fully or part Fighting Types. Because of this, Bea is especially weak against Flying, Fairy, and Psychic Type Pokemon & Attacks.
Additionally, all of Bea's Pokemon will either be at Level 52, Level 53 or Level 54. Due to this, it would be wise to have all of your Pokemon at Level 55 or higher. The more experienced your Pokemon are, the easier it will be to defeat Bea. And finally, Bea will Gigantamax her final Pokemon, which just so happens will be Machamp. Because of this, it would be especially wise to wait to use your Dynamax until she sends out Machamp. Also, it would be smart if the Pokemon you Dynamax is either a Flying Type, Fairy Type or Psychic Type, since Bea's Machamp will be extremely weak to all of those type of attacks.
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