>>58076746The lore surrounding important guardian-type legendaries hadn't yet been thoroughly established, and because he was specifically seeking birds revered as local deities responsible for keeping the balance in check rather than literally any other iteration of these Pokemon, it was seen as a bad thing.
If this guy happened post-SM, no one would even care as long as he's not abusing or forcibly containing them, because guardian legendaries always find their way back to their natural role when they're needed most.