Life orb is Greninja's preffered item because it allows him to switch up moves.greninja could be choice banded if a focus shash is taken up, though it maybe common knowledge by now, greninja is a good physical attacker as he is a special, choice band protean u turn could possibly make him the best scout in the game (arguably) and also along with a charizard killer, rock slide, and aerial ace and waterfall for type coverage
Also is choice band Ferrothorn still viable? It was a pretty suprising set last gen that was able to kill Magnezone and Heatran which were it's biggest enemies.