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