As far as i know Archen is obtained via its fossil which can be received from some guy at the Spindel Museum after taking down the meteor grunts that wanted to take some fossils,so i talked to dem dudes and fought them at tanzan,so after winning i kinda got side tracked by the story and a while latter went to the museum (am at Vs Arceus) but the old man just says:''You are always welcome my friend.'',checked my bag and ofc my PC no Archen or fossil,is it a bug or did i screw up something?