He might already see use against smoker right, cause smoker locks your captains?
On Expert, Smoker preemptively uses his special, which locks
your Captain for four turns, then takes a basic preemptive attack (6,310 damage). After that, it's three turns until he attacks again. However, if he gets an attack when his HP is less than 20%, he locks
both captains for three turns before taking his attack.
Helmeppo removes 3 locks, Morgan removes 2. You could use both to immediately remove the 4-turn lock, but chances are you'll only need one or the other when combined with Usopp's stall. Helmeppo is paired with slasher teams, Morgan goes with STR.
If a team was rocking really, really low damage and high HP, I suppose one could save Helmeppo for Smoker's sub-20% HP special. You'd probably need Alvida, Smoker, GP Chopper, or Jozu to reduce damage while whittling down the other 80%, and Usopp would be saved for the last burst. Academic, though. Most players will find ways to kill Smoker before he gets a second attack.
This one shouldn't be too bad, I hope. It looks like there's lots of options, from G3 teams to Slasher teams to STR teams made up entirely of story mode units. I'm surprised no one's tried cooking up something like Vivi/Hachi. I might try that, for kicks.