Wes is used to the desert heat, so the temperature doesn't bother him so much. What does bother him is that these Pokemon were suffering because of the heat he was so familiar with. Thankfully he still has memories of cooling down Umbreon and Espeon in Orre, so he's got some rags to help cool other Pokemon off.

It's hard not to hear Dawn's surprise in the echo of the cave, so Wes looks up from where he was helping a Snorunt towards the two trainers. After making sure the Snorunt was cool, he stood up and approached them both.

...

"... I'm accompanying you." Thanks Wes. Talkative as ever,