Before you can board SS Anne in Pokemon Revolution Online, you first need to secure a ticket. You can get said ticket from Bill in his lab located at Route 25 east of Cerulean City.
However to acquire the SS Anne ticket, you first need to bring Bill’s Research Book to him. You can find this book below his pillow located at the upper east portion of his lab.
There you go! Bring Bill’s research book to him and he will give you the SS Anne ticket in return.