Talkatoo% is a category on the Category Extensions board for Super Mario Odyssey. This category consists of collecting enough moons to beat the game, but you can only get your moons from either Talkatoo, or Story Moons.
There are 3 sub categories for this category, Any%, Hardcore Any%, and World Peace.
Any% requires beating the game with Talkatoo and Story Moons. Hardcore Any% requires only Talkatoo and no Story Moons. World Peace requires achieving World Peace while using Talkatoo.
What moons Talkatoo gives you is completely random, so you will route your movement on the fly.