This image has now surfaced from the demo~ From anonymous comment on spmb.
We have what COULD BE (ie: this picture’s authenticity has not been confirmed) a new pokemon which appears to be related to Gigaiasu. Its name is ‘Wakoishi’. *If any of you are curious “koishi” means ‘pebble’ so that is probably what its derived from.
Check back for more updates as we try to figure out whether or not this is completely authentic. Thanks for the tip off in chat :]