Force Field Belt Brainiac 5 can use Invulnerability. Give Brainiac 5 a free action and choose an adjacent character with the Legion of Super-Heroes keyword. That character can use Toughness until your next turn as long as it is adjacent to Brainiac 5.

My Question:
Can Brainiac 5 give Toughness to, for example, Wildfire who also has Invulnerability?
I understand that if Wildfire is hit with an attack he could only use Invulnerability OR Toughness (not both) so he could only reduce damage by 2. But if an opposing character Outwitted his Invulnerability, would he still have Toughness?

(Similarly, does the Toughness granted by the Crimson Gem work the same way?)

Cheers.

Yes. Brainiac can give Toughness as a back-up to a character that already has a damage reducer.