Question

It's just like a magikarp that can learn tms

Answer 1

The game would be too easy if all the pokemon were dead simple to obtain! The idea is to make Feebas/Milotic very rare but obtainable for everyone if they try hard enough :)

Answer 2

1. because a milotic is quite the achievment, and you need feebas for that, 2. if you want you should be able to find it in hoenn, with a good rod

Answer 3

They try to make several different means of obtaining pokemon, besides the usual leveling them up. So THat was just them trying out a different way of evolution.