That is a good question and one we had to discuss amongst ourselves for a bit.

The answer we reached is that due to the nature of the game and the way differences in language are already auto-translated for characters, an ability like the 'echo' would not be available in-game. As such, it side-steps the question of the complexities of the pokemon soul (which I am sure is a hotly debated topic in the field of poke-philosophy). We hope this is a satisfactory answer.