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Every Pokémon in your active party receives this ribbon for defeating Leon specifically while in the Master Ball Tier .

His teams often feature powerful Pokémon like Aegislash , Haxorus , Dragapult , and the two Galar starters that you and your rival did not choose. pokemon_sword_shield_battle_tower_boss_battle_m...

Defeating Leon yields essential post-game upgrades and cosmetic items: Every Pokémon in your active party receives this

In Single Battles, you use 3 Pokémon; in Double Battles, you use 4. Only Leon and the player are permitted to Dynamax in these matches. Rewards for Defeating Leon Only Leon and the player are permitted to

Moving through tiers earns you BP (Battle Points), Rare Candies, Mints, and Bottle Caps. Battle Music Battle Tower - Pokemon Sword and Shield Guide - IGN

You face Leon as the final opponent of each tier (Poké Ball, Great Ball, Ultra Ball, and Master Ball).

You must first unlock the Battle Tower by completing the main story and capturing your version’s legendary Pokémon (Zacian or Zamazenta).