she's the reason they're crying /j

Okay but on a more serious note, Briar is surprisingly good with kids LOL She's not trying to be good on purpose but kids just see her as cool, maybe it's her vibes and her whole aura lmao She has these big sister/aunt vibes to her lol And she's surprisingly good at distracting kids (maybe by showing them fire tricks with her Pokémon) and would call the authorities or something and stay with the kid there to wait for their parents to find them. If the parents take too long she would probably buy them dinner and candies/sweets lol Briar is mean and sarcastic but she can't see herself being mean to little kids lol

Needless to say, she doesn't want to see herself in that situation ever in her life.

In Elio's case, he would do his best to calm them down first; he would bring out Jupiter or Estio since the two of them are very friendly toward strangers - especially if they're children. The two would try to get the lost child's attention by performing tricks as if they were in the Performance Stage of a Contest, which would normally be successful due to a young child's natural sense of wonder. Then, Elio would piggyback them to the nearest bathroom to get them cleaned up, and probably buy them a treat (ex: food, a balloon, a toy, etc.) to make sure they remain calm; he would even allow Jupiter or Estio to continue playing with them if it'd make the lost child feel better. Only then would he tenderly ask them what's wrong and do his best to assist them out in any way he could: from tracing the child's steps to using his other Pokemon to a wide search of the nearby area. If necessary, he would get Officer Jenny involved.

This would be one of the few times where Elio's "big brother vibes" would naturally come out in full since he's used to caring for children and/or his juniors - making it easier for him to gain their trust.