You can't actually ride your own Skiddo/Gogoat. You can ride some in certain areas. Those areas are;
>In Lumiose City, there are special boards where you can pay $200 to go through a tour of Lumiose City on Gogoat.
You have no control over Gogoat
>In Route 12 there is a farm full of Skiddo. When you ride Skiddo, you can jump backwards over ledges and ride really fast