Potions and berries are not allowed in this battle.
Blaziken works as DLC 5 for Tifa. Download:
http://www.mediafire.com/download/r10igp6gmy6ylu4/Blaziken_-_for_Tifa_DLC_5.zip
(Lucario is a DLC I did for Prishe, not available for now.)
* Thanks to SkyBladeCloud for the encryption/conversion/modding tools.
* This is a free, non-profit, fan-made mod. I don't own anything. Dissidia, Final Fantasy and related brands belong to Square Enix. Blaziken, Lucario, Pokémon and related brands belong to Nintendo.