I've completed full speed ahead! twice. After I'm warped back to Jueno, Mapitoto just offers me the quest again.
Another site that ryhmes with hihi pie plomedia and another that ryhmes with peachy wheaty, says to talk to Mapitoto for the reward...
I have trainer's whistle key item. They say I can trade my mount items to Mapitoto, but they are key items. What'll I do?
===========
Do'h. Apparently, I can /mount "name". Maybe I missed a release note.