>>43486555He's referencing the fact that Crows are associated with witchcraft.
Also the connection to witches is well beyond surface-level.
>Feared and loathed by many, it is believed to bring misfortune to all those who see it at night.>It is believed that seeing this Pokémon at night will bring about ominous occurrences.>Murkrow was feared and loathed as the alleged bearer of ill fortune. This Pokémon shows strong interest in anything that sparkles or glitters. It will even try to steal rings from women.These entries reference the fear and persecution of witches especially in medieval times.
The shiny stuff is a reference to actual crows who tend to steal trinkets.