Piplup is great.Piplup may be weak with a rumput type but it's super effective with drill peck and peck.Piplup is super effective with api, kebakaran types too.As for electric types,you have to envolve piplup to learn dig.Also when anda envolve it, anda can learn rumput 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 anda had a piplup, it can learn surf and waterfall when it envoles and then anda could meet the champion!Remember,first is a bug trainer so anda can beat with flying type moves like peck atau drill peck.Next is ground which anda can use rumput knot.Third is kind of api, kebakaran 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 anda can use rumput knot!