Jigglypuff vs Donkey Kong

Dont stay on the ground. If he grounds you, you basically lost the stock. Use nair and side b when landing, and be careful of his up air as it can easily beat out your down air

DK physically cannot keep up with Puffs air speed. Just spam aerials on him and stay off the ground. Don’t get grabbed and it should be easy to avoid all of his attacks because you’re faster than him

Read a dash attack. You can shield and punish it with a rest.