Ditto
Transform Pokémon
It can reconstitute its entire cellular structure to change into what it sees, but it returns to normal when it relaxes.
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Competitive
Strategy Overview
Ditto is a niche setup deterrent with the combination of Imposter and Choice Scarf. It removes sweepers like Ribombee and Swords Dance Sneasel and revenge kills fast foes such as Archeops and Whimsicott as well. Ditto also has a fair amount of utility against stall, being able to infinitely copy Audino and Aromatisse and use Wish to win long games. However, Ditto most often will not contribute to a team defensively due to its low HP stat, and it fails to check Substitute users like Perrserker and bulky setup sweepers like Uxie. This generally makes other revenge killers or defensive support better additions to aid against sweepers.
Competitive data from Smogon University via data.pkmn.cc