Kirby: Super Star Ultra Tips

Arena Tips
Use the Yo-yo ability. It is quick and can hit above and below you. You may also use the hammer for its strength.
Save The Maximum tomatoes for when you are low on health, because regular food items appear in the waiting area too.
Always begin with with an ability and a helper, usually of the same ability you have.
Switch abilities and partners in the waiting room.
Hope this helps.