I remember when I first encountered her in FireRed. I thought: "I'm gonna catch that thing!" and I thought that it would have this special Ground-Ghost typing or something. So, I send out my Wartortle, chip away her health, and then I tossed a poke ball. "It dodged the poke ball! This pokemon cannot be caught!"
I think this plz icon is basically what my face looked like when I saw that message:
Still, I really feel bad for the poor thing. RIP Marowak.