Actually, Shuckle is the one Pokémon that gets the proud award for the absolute MOST damage possible damage in-game.
The grand total for the max damage, as of generation 6, is: (NOTE: from TBF Bri 10 at gamefaqs.com)
Seven hundred twenty-one MILLION, eight hundred ninety-nine THOUSAND, forty-eight.
Now THAT is a ridiculously large amount of damage; I'd like to see how you would animate that.
Perhaps an earth-shattering explosion? :D