How do I make Bowser / Bowser Jr. throw hammers?

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I played a level online where it looked like Bowser Jr. threw hammers. I know Bowser does this in the original game.
I tried dragging a Hammer Bros. onto them, but this just replaces them with the Hammer Bros.
How do you make them throw hammers?
Side note: I know putting Bowser Jr. into the Koopa Clown Car makes him throw shells... and putting Bowser into the Koopa Clown Car makes him throw Bob-Ombs.
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How do you get a super hammer in Mario Maker 2?
To unlock the Super Hammer in Super Mario Maker 2, players need to complete the Story Mode campaign. This campaign ends with Mario successfully rebuilding Princess Peach's castle, at which point Taskmaster Toad will have a new job for you.Can Bowser Jr. Throw Shells Instead of Hammers? - Super Mario Maker 2 Mythbusters [#34]
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Images: Monstera, Anete Lusina, Brett Jordan, Brett Jordan