Busted...

: Hey, lookie lookie at what I found in your room!
: Huh - OH CRAP NO errr, I mean... that's not mine.
: Mhmm. There's a "Property of Latios" on there, and you claim it's not yours.
: It's not.
: Then whose is it?
: Um... goo.... sah.... mah.... wahoooa....
: Why are you talking in gibberish?
: maa...teee...behh....gloooooo....
: hehehehehe this can be used as great leverage.

Latios has a dirty little secret.
Also, he's a terrible hider and an even worse liar.
Umgoosahmahwahoooamaateeebehhgloooooooo is not a valid answer to "Whose is it?".