Nope. The trick requires the old man to catch the pokémon, and in Yellow version he actually fails to catch it. No Missingno. for you.Does the fighting Missingno code work in Yellow? The one where you go to the Pokeball teacher, then fly to Cinnebar and can then get unlimited items... yeah....
There's no real secret to getting Bulbasaur. I don't understand why you're having trouble. If Pikachu's happy enough for you to get Charmander, he should be happy enough for you to get Bulbasaur...have you talked to the girl while having at least one open slot in your party?P.S.: How do I get Bulbasaur in Yellow? My Pikachu's as happy as he's gonna get, and I got the Charmander already. I beat Missy already...