The official Mews usually had names containing the word "yoshi". Some used "Luigi" and "Link" as well (names of characters from other Nintendo series). "Chris. W" is a regular person's name that doesn't sound like it would be used by Nintendo.
Event Mews are exceptionally rare, so the odds are any you'll ever come across will have been caught by the glitch. I have no idea about other countries, but I believe in the UK there was only ever 1 or 2 tours done by Nintendo that gave out Mew, and the OT name was "NINTEN" - I don't know about the OT number, however. --- Where logic won't work - I will PAL Gamers unite - http://www.gamefaqs.com/boards/277-pal-gaming
Ya most likely that Mew was caught using either Mew Glitch or a Cheating Device like Gameshark or Action Replay. --- Male...female....... What's the difference? Power is beautiful, and I've got the power! Flea(Chrono Trigger)
You can keep it if you like, entirely your choice.
If you decide to restart the game for your own save file, check the sticky topic to find out how to get 2 Mews of your own before beating the second Gym. --- Where logic won't work - I will PAL Gamers unite - http://www.gamefaqs.com/boards/277-pal-gaming