My Story

How to catch mew, in Blue, Green, Red and Yellow. With use of Glitches without possibility of corruption unless you are extremely unlucky (hasnt happend to me once) .

Step one get to misty.
Step 2 clear the bridge Do not fight the trainer across the water on the left(West) of the bridge we will need him later.
Step 3 Clear the trainers on route 25 going to the house were you get the SS Ticket but do not fight the trainer with Slowpoke, He is a youngster on the northern part of that trail Recommendation is to look him up or save before each of those duels.
Step 4 Continue the game until you get a pokemon with teleport, easy in Blue, Green and Red with Abra so easily obtained, Harder in Yellow.
Step 5 Go to route 5 (the bridge) near Misty's gym go around to the trainer we ignored to the west of the bridge. Now Important save before you encounter him what we are going to do is when we move onto the tile where the trainer will get the ! we try to get into our Start menu. Do this by moving into the tile hitting Start like its your lifes purpose. Now we select teleport sending us back to the gym just south. Now we know this worked when none of our buttons seem to work.
Step 6 go up to the trainer on route 25 that we skipped (the Slowpoke) and we fight that trainer (fighting any trainer will re-enable our buttons but we want to fight the slowpoke).
Step 7 After beating that trainer we start to head back down to the bridge after a certain number of steps going back into that zone we will get a random encounter (Along the path no need for tall grass) and it will be a mew. Now this is important He has a very low catch rate as low as Mewtwo so stock up on your pokeballs and make sure you put paralyze on him as it improves your catch rate.
Step 8 Tade him to newer games or show him off because you now have a Mew without use of a Cheat Engine.
This is 100% legit if done correctly will always work I offer Cute bunnies as a sign of good will.