Question

Where is the veilstone city massage thingy?

Answer 1

The Massage Girl is at the closest house at the Southwest corner of Veilstone City. Just head a bit up from there and enter the home closest to your right.

This tutorial, if necessary, details how to get to the Massage Girl's house from the Pokécenter.

Comments

Image taken from https://guidestrats.com/pokemon-platinum-massage-girl/

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Thanks! I just now remembered to link the site in my answer.