Ice Climbers: Use multiple weapons
Get a beam sword, fan, home-run bat, lipstick, star rod, or parasol. You will only need one of these items. Do a Smash Attack and Popo will use two items (one of those listed previously and his hammer).
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Have Nana and Popo each pick up different items. They will both use their items at once (for example, beam sword and star rod). You can also use two of the same items at once (for example, two super scopes or fire flowers).