Robin (Fire Emblem) is a good swordsman, but that won’t be enough to stop Greninja! Greninja is a fast fighter and he has a large array of attacks. He can strike at Robin from a distance with his aqua based moves. Greninja can also engage in a hand to hand fight with Robin where Greninja’s speed would definitely come in handy. Robin won’t be able to overpower this fighter. Greninja wins.