I thought I'd list down Riku's weapon and stats, when he joins you at the last boss fight. Quoted from Kouli's Kingdom Hearts II guide from GameFAQs:
KeyBlade: Wait To The Dawn (Atk=3, Mag=0)
Abilities: Dark Aura, Dark Shield, Cure Potion, Eternal Session, Item Up, MP
Hastega, Defender, Last Leave, Combo Leave, Auto Co-Op and Hyper
Healing
Co-Op: Session -> Dark Canon/Last Saber -> Master Hearts/XIII Sword -> All Over
His guide is finished, by the way, for people who have the game. It's a straightforward guide (as in no sidquest info).
KeyBlade: Wait To The Dawn (Atk=3, Mag=0)
Abilities: Dark Aura, Dark Shield, Cure Potion, Eternal Session, Item Up, MP
Hastega, Defender, Last Leave, Combo Leave, Auto Co-Op and Hyper
Healing
Co-Op: Session -> Dark Canon/Last Saber -> Master Hearts/XIII Sword -> All Over
His guide is finished, by the way, for people who have the game. It's a straightforward guide (as in no sidquest info).
Spoiler