Gen 1 Catching mewtwo early

Do you like mewtwo? Do you like mewtwo early here's the glitch for ypu . in gen one there were several glitches that together let you obtain mewtwo early here they are: first do the mew glitch in cerulean city the one with Abra and the gym then make it to fusia after making your mew at least level 50 then do the walk through walls glitch now you can enter the cave however you need an escape rope and a Pokémon with fly and one with surf now also get some repellent now once you've done the walk through walls glitch you need to WALK not fly to the cave of origin with this done go find mewtwo catch him use the escape rope fly away. The new is so you have a Pokémon strong enough to fight mewtwo. Also maybe get the master ball before fighting it if you can't get mew.
Here's the bulbapedia link to the mew glitch https://m.bulbapedia.bulbagarden.net/wiki/Mew_glitch. Here's the walk through walls glitch