I don't know but I would beat the league with an exp. share attached to the Pokemon you want to give experience to. It always works for me
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In my opinion, there is not a "best team". Take your most powerful Pokemon of major types, and battle with those.
Breloom...which i also think is one of the most badass grass types :)
Eruption was introduced in Gen. 3 (Ruby Sapphire and Emerald) and is most commonly known to be used by the pokemon Camerupt and its pre-evolution Numel.
Breed Pokemon in the daycare but in most games there is someone who gives you an egg.
in Platinum on your way to the spear tower the detective gives it to you in Mt Coronet. it is most likely the same in pearl.