Yo dude, if you get this before your match, READ IT
I just played a really good Jiggly today, and I noticed two things about her. 1. If you can charge up a smash attack quick enough and time it right, you can completely counter the Jiggly roll and hit her hard. 2. If you're good at Meteor Smashing (you're a great Gimper apparently), GO FOR IT, Jiggly's really hard to knock off the stage.