If anyone is wondering what the gameplay mechanics is for, it's because Ditto can't transform if the opponent is using a substitute.

Blue_Stuff said:

If anyone is wondering what the gameplay mechanics is for, it's because Ditto can't transform if the opponent is using a substitute.

It's all over the /r/Pokemon. Best strategy for SOS chaining Dittos, that is.

Rathurue said:

It's all over the /r/Pokemon. Best strategy for SOS chaining Dittos, that is.

The Sneasel is telling the Ditto to call for help. The Ditto is calling for help, but the other Ditto are too scared to come. I'm not confident in my translation skills, but I'm pretty sure that's what the image says.

Rathurue said:

It's all over the /r/Pokemon. Best strategy for SOS chaining Dittos, that is.

well that explains all the shiny dittos in the GTS.