Pokemon emerald complete pokedex reward

We only want it completable in at least one game (because then we can just trade to all the others).

Pokemon emerald how to complete pokedex without trading

Amongst my friends, we have Fire Red, Pokemon Leaf Green, and Emerald, a Gamecube, and a few Gameboys to trade with. I know we'll have to restart one Kanto game at least once, but restarting Emerald 3 times seems ludicrous.

So which other Gen 3 games (XD, Sapphire, Coliseum, Ruby) can give us Johto starters and our current unobtainables like Lunatone and Zangoose (trying to buy the fewest games possible)?

The absolute minimum to get all 382 non-event Pokémon is: LeafGreen, Emerald, Colosseum, and XD. That's because Ruby and Sapphire combined have less Pokémon than Emerald, and FireRed doesn't have anything unique.

Also, LeafGreen is the only one of the seven that has Slowpoke.

which other Gen 3 games (XD, Sapphire, Coliseum, Ruby) can give us Johto starters and our current unobtainables like Lunatone and Zangoose (trying to buy the fewest games possible)