The point is, there is no way how Kecleon would get these moves with Protean even postBank; it's only a gen6 ability, and said crucial moves are only aviable in gen5.
Kecleon gets Shadow Sneak and Sucker Punch via level up, and all Egg moves (Recover) will be available to it via Smeargle. Most of its tutor moves, bar say Aqua Tail, don't help it tremendously as imo Kecleon would much prefer neutral coverage than super effective coverage if it wants to do any Power-up Punch sweeping.
What about patching up that silly low Speed with Rock Polish?
Diplodocus Dash
Aurourus @ Expert Belt/Leftovers
Ability: Refrigerate
Timid Nature
248HP/216SpA/48Speed
-Rock Polish
-Nature Power (Tri-Attack Ice)/Freeze-Dry
-Psychic
-Hidden Power Fire
Gets the bulk it needs to take a few NVE hits (read: Tackle from 0- Atk Magikarp). If you scare something out with Aurorus, that is, switch in on a Swellow or something, you can Rock Polish. With the spread I gave you won't outspeed everything but most things are outpaced by this glacier dino. E-Belt is a nice option because most things are hit for SE with those moves (I don't promise you'll KO anything without STAB Ice moves). Leftovers barely increases survivability.
...
Eventually someone will make this dino viable.
I much prefer physical Aurorus if I'm honest. Ice Return, Earthquake, Stone Edge? YES. It serves me well on WiFI despite Aurorus's Base 77 Attack (for reference, lower than Geodude).
What does Psychic hit? Ancientpower is better so you can do away with Fire-types, or Thunderbolt to hits Waters if Nature Power is used. Even though Aurorus has Rock Polish and its offensive typing is pretty damn fantastic, it seems more and more awkward each day I look at it.
- It's slow enough where that typing really becomes as much, if not more as a burden than a blessing.
- Its 99 Special Attack stat is (barely) decent and its movepool is colorful (yeah that's the word I'd use), but kinda 'meh' in terms of both power and coverage, Refrigerate Nature Power / Snow Warning Blizzard being your only true power move (Aurorus isn't strong enough to make Freeze Dry its main attack).
- Its physical movepool is stronger and more straight to the point, but 77 Attack is very average in terms of sweeping.
It could do okay in NU due to its STABs alone (they cover a lot I'll tell you that much), but difficulty in its
need to set up hinders it greatly. Those stats are in all the wrong places.