If I have a ditto in a triple battle with the imposter ability and there is (ex:rhyperior sableye and dusknoir) who does he transform into?
Its a random choice it would just be like flipping a coin, a three sided coin
Well what I think is most probably it would transform into one of the pokemons that ditto can target . For eg. If ditto is on the right . It cant attack the pokemon on the left and can attack only the pokemon in the centre and right so probably transform into one of those.
Again im not sure because I havent tried this yet but I hope this is quite what it is.