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 ...

Final bosses don't come much more creative or unhinged than Photoshop Flowey (aka Omega Flowey) at the end of Undertale's neutral route. This heavily segmented battle reveals Flowey's final form ...

Undertale actually has two examples of save data tomfoolery, but the first is actually fake-out. Once you defeat Asgore, the next time you go to save your game Flowey will appear instead - proudly ...