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No. They just take 45 damage, but consider you cannot attack him with your regular attacks until you can get him to attack you, it does really do a decent amount of damage. I think they have at least 190 HP (b/c I have killed them in 1 attack if I do 195+ damage)
It seems like not only the moves of the Kecleon vary, but also their stats, as I was able to OHKO some that I was fighting at Mt. Blaze about 90% of the time with a regular attack, but I couldn't ever OHKO some that were at Wyvern Hill the same way.