[Guido]

Originally Posted by Busaiku Chama

Wait so...

Spoiler:

Gary's actually back? He stopped being a researcher and all that jazz? Or was that just a detour thing for him?

To your first question: yes.
To your second question: no.
To your third question: it was just a detour visit.

Spoiler:

His Elekible had exhausted its energy, and that's why he headed at Oak's to have it fully charged.

When he was about to part Oak asked him if he (Gary) was leaving again since he (Gary) had already come back from Shinou. Meaning that Gary had already visited Shinou once but is going to take a second trip there.

Don't forget that Pocket Monsters Diamond & Pearl starts the last Thursday of September, premiering on a 90-minutes special; the first three episodes will be broadcasted.