Piplup is great.Piplup may be weak with a ঘাস type but it's super effective with drill peck and peck.Piplup is super effective with আগুন types too.As for electric types,you have to envolve piplup to learn dig.Also when আপনি envolve it, আপনি can learn ঘাস knot to beat water types so easily!Don't forget it can also envole to Emploen and learn hydro cannon!And don't for get metal claw either!Piplup is also very strong with it's torrent ability.Piplup is cute and when it envoles to Emploen,it looks tough and it may be too!Also,if আপনি had a piplup, it can learn surf and waterfall when it envoles and then আপনি could meet the champion!Remember,first is a bug trainer so আপনি can beat with flying type moves like peck অথবা drill peck.Next is ground which আপনি can use ঘাস knot.Third is kind of আগুন so Piplup can beat them easily with a water type move.Last, is a phychic type but I have no advice.Finally,the chamion's strongest pokemon is Milotic so আপনি can use ঘাস knot!