[At that, Pansage starts waving an arm frantically--no no, Archie would never leave without you! Not willingly, anyway, we're sure.

Still, Cilan sighs as he leans down a little now to speak with Mightyena at a matching height.]

I'm... really sorry that we're the ones who have to tell you this, but... your trainer passed on, recently. [Died... was executed... all of which just makes his throat stick, hence going with the former description of it, trying to be as gentle as possible.] Before he did, he asked everyone to keep an eye out for you and the rest of his Pokemon and make sure that you were alright in his absence.

[So... like Pansage said, it wasn't a willing choice regarding Archie leaving you behind. Sorry Mightyena.]