Well, unless you get lucky, probably a long time.
mostly magikarp
You can catch up to a level 100 magikarp in the lake in the resort area next to your villa. It can be any level between 1-100. It will take a while but you'll just have to be patient i didnt take me very long to get the lvl 100, i just caught it 10 minutes ago and since magikarp is a weak Pokemon it should be farely easy to catch, but be very careful not to make it faint. After about 20 minutes u could have like about 2 or 3 lvl 80's or lvl 70's. Hope I helped :) - evang9
It is a level 100 magikarp.
he gives u a magikarp lv.100
There are only Magikarps' in the water at the resort area. If you use a Super Rod, you can hook a Level 100 Magikarp. A level 100 Magikarp can never evolve into a Gyarados because.... its at level 100 unless you use a hack.
It makes no difference which side you fish on as long as you are fishing with the Super Rod in the small lake in the Resort Area in Pokémon Platinum.
there is some dood in the resort area who will tell you about the ruler of the pond lmao if you go fishing long enough, it is actually a level 100 magikarp (NOT A JOKE)
Your best bet would be to use the "all Pokemon shiny" code for your game then go fishing in the Resort Area for the level 100 Magikarp that can be caught there. In Platinum, that is.
Anything you want
simply....... no
There is no way to get a Shiny Magikarp 100% of the time.
That is a legend. Although, you can catch a Magikarp with an old rod on level 5. Then use a cheat to get numerous rare candies then you can put it on level 100. Or you can just train it to level 100, but that would take forever. Also why would you want a level 100 Magikarp when you could have a level 100 Gyarados. Gyarados is much better and is actually one of the best Pokemon is each game. So my suggestion to you is to have a level 100 Gyarados. I hoped this helped!
It is a level 100 Magikarp.
mostly magikarp
You can catch up to a level 100 magikarp in the lake in the resort area next to your villa. It can be any level between 1-100. It will take a while but you'll just have to be patient i didnt take me very long to get the lvl 100, i just caught it 10 minutes ago and since magikarp is a weak Pokemon it should be farely easy to catch, but be very careful not to make it faint. After about 20 minutes u could have like about 2 or 3 lvl 80's or lvl 70's. Hope I helped :) - evang9
level 100 magikarp!?!?
i think it is a lv. 100 magikarp!?!?!?!?!?!?!!?