What it would happen if a ditto is fighting with a ditto ?will the battle ever ends ?what it would happen if a ditto transform to an already transformed ditto (already transformed ditto =pikachu for example )?
Ditto can't transform into an already transformed Ditto.
Source: http://bulbapedia.bulbagarden.net/wiki/Transform_(move)#The_Transform_paradox
Ditto can transform into Ditto, but then Transform wouldn't work because you're already transformed.
Source: experience
The wont transform and would have to use struggle.
Source:Experience