"Yep, yep, heard it all. And..." The trainer reaches into her bag and retrieves a clearly foreign Pokeball, not Kantoan or Londoan. "I've got a little lady right here who's begging for a new home. She doesn't really get along with my team, or me, bummer, right? You always hope they will, but sometimes things just don't work out. She's a Mawile, you've got those over here, right?"

Spoiler: OOC
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Yes! In fact, they're rarely found around Alyssa's hometown Vibrost Town and Lord Vibrost uses one as his ace.