Jeremy
She was in her Elite 4 outfit, because why not? She brought her cane aswell and she just walked around the store, seeing if there was anything that caught her eye. So far there wasn't anything, but she continued to explore the store, since she didn't really have anything else to do.
John
"Ahh... That Doc guy got the best of me earlier", Marko says as he enters the clothing store with Chomp-Chomp. "Anyways, it's time to get some new clothes,". Marko would see an interesting trainer nearby. He'd want to talk to them, seeing them being another Elite Four member. "Chomp-Chomp, lets go investigate this person... Eh?", he tells his Garchomp as he approaches Monika.
Jeremy
She knew that there was someone approaching her and she turned around. "Greetings." She greeted the man walking up to her with a small smile.
John
Hello, I'm Marko, and this pokemon beside me is Chomp-Chomp," Marko says to Monika, with a small grin. "What's you name, you seem pretty nice,". Marko would be a little patient asking her questions, especially about where she came from, etc.