>>14731950You can if you want. You sacrifice a bit more power but if you need the potential burn, go for it.
>>14732013That is better suited to a physical set since he gets quick attack and shadow sneak.
>use quick attack, become normal>opponent sends out fighting type>shadow sneak to become ghost>opponent sends out a non-ghost with ghost move>quick attack to be immuneBest way to counter a scarfed mon. Round out his set with water shuriken and power-up punch for more priority and even some attack boosting. Other options include aerial ace/acrobatics for earthquake immunity, rock tomb, and night slash.
Greninja has a great move pool to choose from. It's hard to nail down 1 group of 4 moves as his "best."