This item can be found in the glowing water area of Waterfall, seen just after an area where Sans with his telescope, Loren, and the Nice Cream Guy are located. If the bridge to the left of this area is traversed, a small area with a bush in the center can be found.
The Ballet Shoes are located in the bush. Undyne mentions this item to a protagonist in a phone call and says "There's normally a pair of old shoes in that seagrass." She then encourages the protagonist to take them.
When attacking with them, three bars appear instead of one. The animation appears to be the bottom of a shoe, as though the protagonist kicks when using the item.
|Consumables|| Monster Candy • Bandage • Spider Donut • Spider Cider • Butterscotch Pie / Snail Pie|
Snowman Piece • Bisicle / Unisicle • Cinnamon Bunny • Temmie Flakes • Abandoned Quiche
Dog Salad • Astronaut Food • Instant Noodles • Crab Apple • Hot Dog...? / Hot Cat
Glamburger • Sea Tea • Starfait • Legendary Hero • Bad Memory • Last Dream • Popato Chisps
Nice Cream • Junk Food • Steak in the Shape of Mettaton's Face • Hush Puppy
|Weapons|| Stick • Toy Knife • Tough Glove • Ballet Shoes • Torn Notebook|
Burnt Pan • Empty Gun • Worn Dagger / Real Knife
|Armor|| Bandage • Faded Ribbon • Manly Bandanna • Old Tutu • Cloudy Glasses|
Stained Apron • Cowboy Hat • Heart Locket / The Locket • Temmie Armor
|Miscellaneous||Punch Card • Annoying Dog • Dog Residue • Undyne's Letter (EX) • Mystery Key • Silver Key|
|Cut Content||Croquet Roll • Rock Candy • Pumpkin Rings • Stoic Onion • Ghost Fruit • Puppydough Icecream|