I found this (differences bolded):
Greninja with Expert Belt
Ability: Protean
EVs: 252 Spd / 252 SAtk / 4 Atk
Hasty Nature
- Dark Pulse
- Hydro Pump (or Hydro Cannon, but must rest a turn, so makes it a sitting duck to the next Pokémon in battle)
- Ice Beam
- U-turn
U-Turn gives a STAB attack and then retreats from battle so I don't have to just switch out doing nothing in case of need, though as last one standing gives Bug type and many weaknesses. I'll avoid looking for a Fire hidden power because I'm going for a 6IV and I don't think there will be too many Bugs (the problem that Fire addresses on my team, and Protean also helps avoid that dilemma) showing up. I can also grab Bounce from Froakie (con: it's a two-turn move defended by Protect; another con: Flying is still weak to Electric), or - should an Electric type appear - spam Dig provided it's not levitating or flying (immunity FTW, imagine if Electric is last and I can outwill it!).
Of course, using Dig means I'm hoping someone doesn't Protect every time I use it. If I outspeed anyone, however, I can force them to take the hit if they want to get an attack in on me. I can vitamin Dig up to 16 PP and hope the opponent only has 10 Protect. Also, Earthquake would be death.
Greninja with Expert Belt
Ability: Protean
EVs: 252 Spd / 252 SAtk / 4 Atk
Hasty Nature
- Dark Pulse
- Hydro Pump (or Hydro Cannon, but must rest a turn, so makes it a sitting duck to the next Pokémon in battle)
- Ice Beam
- U-turn
U-Turn gives a STAB attack and then retreats from battle so I don't have to just switch out doing nothing in case of need, though as last one standing gives Bug type and many weaknesses. I'll avoid looking for a Fire hidden power because I'm going for a 6IV and I don't think there will be too many Bugs (the problem that Fire addresses on my team, and Protean also helps avoid that dilemma) showing up. I can also grab Bounce from Froakie (con: it's a two-turn move defended by Protect; another con: Flying is still weak to Electric), or - should an Electric type appear - spam Dig provided it's not levitating or flying (immunity FTW, imagine if Electric is last and I can outwill it!).
Of course, using Dig means I'm hoping someone doesn't Protect every time I use it. If I outspeed anyone, however, I can force them to take the hit if they want to get an attack in on me. I can vitamin Dig up to 16 PP and hope the opponent only has 10 Protect. Also, Earthquake would be death.