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Reminder that Pika Papow is a partner move exclusive to partner pokémon. Ash's Pikachu is a partner Pokémon, since it can use gigantamax (originally only partner Pikachu/Eevee could use it)
The "partner" in Partner Pokémon is 相棒 (Aibo), same as the episode's title, in contrast to the commonly used パートナー (paatonaa), which is what characters tend to use to refer to their partners (Leon called Charizard that way in this episode)