Magikarp -> Gyarados

All of the gods. Good luck.

But a point though, even if the community adores 100% iv pokemons, I wouldn't necessarily evolve that one, at least if you are 24+ lvl trainer.
That magikarp has very low CP, and to power it up to full you will need an enormous amount of stardust, which is a rare resource and could be used for other pokemon. As a result you have a 100% iv gyarados, which still is not too good at the gym and possibly has twister (in which case you won't power it up in the first place, and you have wasted 400 candies to 900cp gyarados)

Goodluck

Man, I have caught so many Magikarps none of which were 100%. Good luck to you man, I really hope you don't get Twister. Let us know!

My first Gyrados was evolved from a 100% IV Magikarp. I didn't actually do the evolve for 2 or 3 days after I got the 400 candies as I was just too worried about getting Twister. But I ended up getting Dragon Pulse so that was cool...

But now I have fought a ton of Gyarados with Twister and it is truly awful. I sometimes wonder if I should even bother dodging Twister as it is such a weak attack.

I now have close to 900 Magikarp candies and I have yet to evolve my 2nd and 3rd Gyrados as I am still worried about Twister (plus I was thinking maybe I would get lucky and get another perfect Magikarp).

Good luck.

The last Magikarp I evolved was 100%, but guess what.. I GOT TWISTER! Candified it right away, fuck that! I got a 90+ with Dragon Breath and Hydro Pump (my first Gyarados actually), will have to wait for another golden karp