Battle:
Go! Ditto! (~Inferno~) Go! Ditto! (Mew.) (Just An Example.)
Turn 1:
Ditto Used Transform! Ditto Transformed Into Ditto!?
What Would Happen?
Nothing, the Move will just fail and waste a Turn and PP.
Transform will not work if the target's current species is Ditto.
http://bulbapedia.bulbagarden.net/wiki/Transform_(move)
