this one doesn't really have phases, besides the classic's sub-phase in which the AU lacks. the encounter is different just to give spice, though you can also apply this to other battles if you so wish. basically, the options remain the same (FIGHT, ACT, ITEM, MERCY), with the same mechanics on all. it's just the battle itself will be more Pokemon styled than UT styled (so the player doesn't necessarily go through bullet-hell). still difficult, due to what the AU can do that, in some areas, the OG lacks. the boss is easy on its own tho, due to decreased stats, though may be SLIGHTLY harder than OG Toriel battle due to Electric-type attacks being mixed with Fire-type attacks. may still prove to be a good tutorial-styled main-boss for the AU.
c2a, as always- :D