Don’t you just need 2 copies? One to hold the Mewtwos and another to keep doing new games?
Don’t even need a new game. You could clone pokemon by turning the game off mid-trade. My school had a kid that got a Mew from an event, then cloned it for everyone who wanted one.
It became possible in GSC to clone with a single cart. Switch boxes and time a restart correctly during the save and bingo bango, you have a cloned pokemon with whatever item it was holding.
This was awesome for getting extra Master Balls and Rare Candies.
You could clone items in the original games too iirc you would go swimming somewhere near cerulean city and keep going back and forth over the same spot and I think it would buffer overflow the item count for a certain slot in your backpack with a nearly infinitely high number.
You could do it with one copy probably. But this was pre-internet so harder to know about the glitches and such.
I think many people figured out the Missingno shoreline kept some form of “last encounter table” in it, so I wouldn’t be surprised some people may have tried to go there right after Mewtwo to chance themselves at more.
Unfortunately we do have that info nowadays, and we know that doesn’t work.
this was basically me for a while, had a team that was all deoxys forms named after 4 of the spice girls + two Arceus named after the last spice girl and Barack Obama
This is gangsta shit
First Pokemon movie released in Japan in July 1998, in the US in November 1999.
Pokemon red and blue released in the US in September 1998, yellow in October 1999.
No U.
The trick was to clone Mewtwo in a later Pokemon game, trade that to a “middle man” Pokemon game that was compatible with Red and Blue, and BOOM all Mewtwo gang!