yes.Put the weak Pokemon first in the party.Then do a battle switch the weak Pokemon with a strong Pokemon kill the wild Pokemon the weak one will get credit.If you give it an exp.share and do the same thing the weak one will get even more credit.
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Train it as you train all pokemon.
Get into a double battle have your weak Pokemon go out with a really strong Pokemon also have your weak Pokemon either hold exp share or lucky egg defeat the trainers and your Pokemon will level up! Even faster way? Have the weak Pokemon your training be traded to you from another game its experience will be boosted and will get lots more exp at the end of battles just as long as you copy the above steps your fine.
The Pokemon that are weak to bug Pokemon are Pokemon that are the grass, poison, or psychic type.
Water type Pokemon are weak to electric type Pokemon.
one that is the same type of Pokemon weak levels weak moves and some one who blows at playing