Can Pikachu defeat Legendary Pokémon?

Can Pikachu defeat Legendary Pokémon? Pikachu is one of Ash’s most powerful pokemon being able to defeat psuedo-legendary pokemon such as Metagross and Dragonite and even actual legendary pokemon such as Regice.

Pikachu is one of Ash’s most powerful pokemon being able to defeat psuedo-legendary pokemon such as Metagross and Dragonite and even actual legendary pokemon such as Regice.
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