[@Shiny Keldeo]

Spirit seems like the kind of pokemon that likes to be highly organized; Organized pokemon tend to follow patterns and considering the strict training schedule that Spirit keeps his children on it would make perfect sense for him to follow a routine of training them at the dojo in town after lunch. 

Since Gredy is local and a big fan of the Guild, it wouldn't be strange for him to know about this and thus save everyone a lot of time and trouble by leading them right to the Guildmaster. At least, that's my logic anyway.