[Latias has been practising her ability to transform into a human lately, and she's been able to hold it pretty well now! And with a little imagination, she's worked out how to makes her clothes seem prettier than usual. Nothing too fancy (that hurt her head), but enough for something like this, she hopes.
She spots PM and recognises her from another event ages ago. So she is going to wander over and waves happily at her. Can't exactly talk like this, but that's okay!]