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One potentially interesting move to stick on Protean Kecleon is Skill Swap. I've got one with Fake Out, Feint, Shadow Sneak, and Skill Swap, with EVs optimized for defense, whom I break out in triple battles. They never see it coming.
However, having something with such narrow utility means the rest of its teammates have to work extra hard on offense, so you need to get as much bang for your buck as possible from that Skill Swap. Slaking makes a good teammate, but team preview will make it pretty obvious what you're up to. I've also tried it with a Focus Energy / Scope Lens Hydreigon (100% crit rate negates the penalty of Draco Meteor), but that requires a lot of setup. Archeops and (Unnerve) Tyranitar are good choices too - anything with big numbers, a wide movepool, and either too many weaknesses or an ability it doesn't care about.
You probably want to put Kecleon in the middle to start with. Switch out one of the corner guys on the same turn that you have Kecleon target it with Skill Swap. (U-Turn or Volt Switch on something slowish with a Red Card can help disrupt your opponent's opening move - or you can take a chance on bringing something so scary that the opponent will want to target it, and having it hold an Eject Button, so it can act and bug out on the same turn. You have a lot of options because of how slow Kecleon is, or you could have even more by holding a Lagging Tail.
If you went with Slaking or Archeops or Regigigas, you can now use Skill Swap to give that Truant or Defeatist or Slow Start to any troublesome enemy. Or just switch out when you have an opportunity. Just be careful - getting rid of Protean in this way means Kecleon will be stuck as a Psychic type, making it vulnerable to Knock Off and other common Dark moves.
Be careful you don't do a mistake that I have done, which is try to use Skill Swap on the same turn as a Klefki uses Crafty Shield. You will cockblock your own combo.
Triples is the Zombocom of formats: you can do anything.
