Does the commercial helicopter training in 61.129(c)(3)(i) require a CFII? For the commercial ticket in a helicopter you need 5 hours of hood time. Can any CFI provide this training or does it require a CFII?

14 CFR 61.129(c)(3)(i):


  Five hours on the control and maneuvering of a helicopter solely by
  reference to instruments using a view-limiting device including
  attitude instrument flying, partial panel skills, recovery from
  unusual flight attitudes, and intercepting and tracking navigational
  systems. This aeronautical experience may be performed in an aircraft,
  full flight simulator, flight training device, or an aviation training
  device;
A CFI can give the training because it's training "solely by reference to instruments". If it were "instrument training", you would need a CFII.

See the Jablecki (2016) interpretation, which addresses your specific question:


  In order to provide instrument training for a commercial pilot
  certificate or ATP certificate, a flight instructor must have an
  instrument rating on his or her flight instructor certificate.
  However, §61.129(c)(3)(i), unlike its counterparts in §61.129,
  does not have a requirement for "instrument training" as defined in 14
  CFR §61.1. Instead, §61.129(c)(3)(i) requires training on the
  "control and maneuvering of a helicopter solely by reference to
  instruments." Therefore, the training in §61.129(c)(3)(i) is not
  considered "instrument training" that requires a certified flight
  instructor to have an instrument rating on his or her flight
  instructor certificate.