Asgore and Flowey are among the final boss fights of Undertale, coming after you've explored The Core. The following boss is designed to be played as part of a complete Pacifist guide - in short ...

This heavily segmented battle reveals Flowey's final form after he absorbs the six human SOULs, transforming into a nauseating, skin-crawling fusion of flower, human, and machine.

Pre-orders for Undertale's Human Nendoroid are open. It will include a SOUL, Flowey and it will be compatible with the future Toriel figure.