Quick Stop in Traverse Town
With the collection of another Navi-G Piece, talk to Cid behind the Accessory Shop to trigger a cutscene while he installs it. When he returns, he gives you Transform-G. You can now access a new world on the World Map. But before you head out, stop by the Dalmatian House and speak with Pongo and Perditta. By now, you should have located enough Dalmatian Puppies to collect the final Torn Page and a few other prizes as well.
Once you’ve grabbed this last Torn Page, head over to the Magician’s Study and examine the story book sitting on the desk by the bed. This will lead you to the 100 Acre Wood, which should be 100% completable at this point.