I use a Luxray in Pokémon Champions, and the Flame Orb isn't an item yet, so I've been running Intimidate on her, which has been going really well for me. The times I've tried using Guts on her have been in Doubles where one of her teammates knows Will-o-Wisp, and it leaves her in a dangerous position when I do that, so I've been running Intimidate since it's proved very useful against many opponents.
I intend on giving her a Flame Orb to run Guts on her all the time once the Flame Orb is added to Champions, but it feels very risky.
So, Intimidate or Guts holding a Flame Orb?