Do they get a saving throw?

[partyrico]

The monk archetype sensei has an ability at 6th level where they can give monk abilities to allies. If I have gaseous form through qinggong monk, do enemies get a saving throw if I try to give it to them?

[Ximen Bao]

eta: Last post cancelled per rereading of spell.

Targets have to be willing. No save necessary. Auto-fail if they aren't.