Palkia is a pretty powerful Pokemon and his Arm Blade attacks can deal a lot of damage. Luckily, Lucario can block these strikes with his psychic sword or just evade them altogether. He now has access to his Mega form, which makes his power legendary as well. Lucario’s main advantage in this battle is his super speed and it may be a deciding factor in his battle against Palkia. Lucario wins.