Pokemon Stadium 2 - Little Cups - Transfers ONLY from new game FAQ:

Q: What is this run?
A: Basically, only use transfers to beat the Little Cups, while starting from a new file of Crystal. So you have to play through the game and build a team to the point you then beat the Little Cups.

The reason it is transfers only, is because otherwise the fastest method would be to to just use Rentals to avoid the team building altogether.

Q: How are you going so fast in Crystal??
A: That's the Dodrio Tower, a mode in Stadium that lets you play GSC at 3x speed, as long as it's connected with a transfer pak.

Q: Is Pokemon Stadium 2 from a new save file as well?
A: No, otherwise you couldn't do both the Little Cups without all the other stuff.

Q: Will you do a run of Complete Game with transfers from new game like this?
A: No, because grinding to L100 for Prime Cup would be insanely boring and not fun.

Q: Will you do other cups/parts of the game like this?
A: Yes, I plan on doing Petit Cups too, I've already done Pika Cup, and might do some GLC stuff in both Stadium games. Can also do stuff in Stadium 2 in both Gen 1 and 2.

Q: What is the route for the team you want to make?
A: Basically trying to make a team as early as possible that can win, which I think will be by the end of Rocket HQ. There's tons of stuff in there that's insanely helpful, including the Theif TM, and boomers.

So the idea is to get a team of Level 5s with a couple of boomers, and use Abra to clean.

So Koffing and Geodude will be bred down Self-destruct, Abra will get the Elemental punches and Theif (Psychic isn't until Kanto), And then other support will be Rattata with max power Frustration, and Poliwag with Surf.

The 6th option will just be Togepi Egg filler.

Q: What about the Odd Egg??
A: Yeah I thought about this, but it's too unreliable. If you got Elekid/Magby they could do good work with the Ele punches, but it's not that common. So I'd rather try to win with Abra first, and just use Togepi so the team is consistent.

Q: Why Crystal over Gold/Silver?
A: Originally I was thinking about using the Odd Egg, which is Crystal exclusive. Low level Poliwag in the wild is still only in Crystal, so the team is easier to make in that regard, but this would definitely be doable in Gold/Silver as well.

Q: Do you know if this will work?
A: Nope, just mapped out a general idea purely based on theory, I've done no testing at all. Given the nature of this run using multiple games and a transfer pak, the way to test this is with a run