What happens during Drifblim's "Damage Transport" Attack if I have less than 4 damage counters on one or more of my Pokemon?
If there are 4 or less damage counters on one of your Pokemon you must move all of them.
Source: Ultra Prism FAQ (2018-01-19), TPCi Rules Team (2018-02-01)

Relevant cards

Note: All applicable cards may not be listed below.
SM5_52