Question

Not including ashs or any of his friends pokemon

Answer 1

Meowth. In almost every non Black/White episode, Team Rocket plans an ambush on Ash and his friends. And Meowth always appears to say the Team Rocket motto.

Comments

In D/P series, Wobuffet comes in second.

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What about Pikachu? The one Ash owns?

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he said excluding ash's and his friends pokemon