Rock eggs event.

you can receive Rock eggs from Professor Bellis to hatch into rock type Pokemon.

Pokemon U can get are:

Aerodactyl, kabuto, Onix and geodude.

Date and time: August 10th at 11pm to August 24th at 10:59pm.

Important bits:

You will get one limited time incubator.

You will have an increased chance to get Rock eggs in event battles.

You must of completed main story chapter 1 the more the merrier in single player normal mode.