Archen is first seen running past the player and partner as they chase after Swirlix after she ate all their food. He later accompanies them on an expedition where they discover the stone bodies of Latios and Latias.
"And that's all there is to it. I don't care where we go. Just give us the cheapest passes you've got."
When woken up by Lapras:
"I feel like I've been sleeping for hours... Where did we end up, anyway?"
"*yawn* I guess my brain is still sleeping, because I've got no idea where we are... I'm completely lost. Why don't we fire up the Expedition Gadget's map and have a look? What in the— Th-the Air Continent?! Wait... What? We...we came all the way to the Air Continent?!"
"All you had to do was take us to some little island near the town! How could you dump me here, Lapras?!"
"Urk! I did? I never even looked at the passes that I bought... Sorry, kids. And this is your first trip overseas and everything... Look at me, ruining your first big trip because I wasn't paying attention..."
"Erm... Just for a little bit then. Well, this is Baram Town, anyway. It's got a café and shops and all, just like back in Lively Town. You can go exploring dungeons from here, too. All the dungeons from the Air Continent can be reached from right here, in fact. But we're not going to any of them today. You got that? We'll have a quick look around the town and then get you two back home safe."
The morning of the first day in Chapter 15:
"How are they gonna turn HIM to stone?!"
"This warning was in the plaza... I can't imagine Entei losing..."
After Cave of the Deep:
For more information on this Pokémon's species, see Archen.