Well, this is if you have Pokemon Emerald and LeafGreen AND you know how to duplicate in Emerald, then follow these steps. It'll take some time though. (You need a MasterBall in Emerald too.)
1. In Emerald, make ANY Pokemon of yours HOLD a masterball.
2. Then, duplicate that Pokemon the number of masterballs you want. (EX. I want 10 masterballs, so I duplicate it nine times. {remember, it's counting the one you already have})
3. Take the masterballs from the multiple Pokemon.
4. trade Pokemon that are holding masterballs to leafgreen.
Sorry I didn't give you UNLIMITED but that's all I have. Oh and also, don't use ALL your masterballs, then you can't duplicate any more. So I hope this helped!!
Materials:
-two Pokemon games
-two game consoles
-trading cable
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I think there are an Unlimited number, because if you manage to get a green shard from a wild pokemon, you can trade it with the shard hunter for a leaf stone. (He has an unlimited number of them, as long as you have a green shard to give him.)
you can't get mamoswine in Pokemon leaf green because it doesn't exist in leaf green
behind the door is leaf green u enter the Pokemon leaf green world
She does its either Leaf or Green.
To be nice, I'll give you the code for PP Max too.(These are GAMESHARK-codes.)Pokemon Fire Red (M)0000295F000A101DC9D40007830050000000830050020000Pokemon Leaf Green (M)00000554000A101DC9B0000783005000000083005002000082025840 0047 = PP Max in PC82025840 0045 = PP Up in PCThere is unlimited of them!82025840 0001 = Masterballs in PC (Just in case you want)