I have seen many videos of people on YouTube performing the MissingNo glitch on the virtual console Pokemon Red/Blue (e.g.), but I can't seem to make it work. I am doing the exact same stuff the videos are doing. What am I missing..? I've surfed for 20 mins, no luck. I'm champion of the league.
It seems like this glitch does not exist in the Italian version of the game; this could be why you are not managing to reproduce it:
This glitch was fixed in the Spanish and Italian versions of Pokémon Red and Blue by making the shore tiles act as water tiles