Clutterfunky

You'll thank me someday

 Bro that's so complicated but I'll have to give it a shot, thanks!

Most of the items held by the Pokemon of Clown Indra aren't available yet in the game. There was a time when I used an A-Muk against him in Agate Circus since it's one of the rare Pokemon who can learn all those moves simultaneously along with Snorlax and the three elemental monkeys. Clown Indra fights you with one of his ten mono-coloured teams. You should try to challenge him and keep your fingers crossed to battle against his yellow team as this one includes a Ribombee holding a Focus Sash. The topic I posted above explains the steps to follow for "items laundering" since you're not supposed to end a fight with an item belonging to your foes, even if you stole it by using Thief.