Who to give steady breath to?

Finally pulled a b!ike, bad ivs (-atk/+res) so i'm not guilty about saccing him for steady breath
But who do I give it to? I have a +spd/-hp nowi, +atk/-hp nowi, +atk/-spd y!tiki, +def/-spd a!tiki, or even ninian +spd/-atk
Trying to make a dragon emblem team with myrrh as the green dragon