Yes you can I think it's a lake afar!!!
I'm pretty sure you can recruit magikarp at Lake Afar.
Yes
he is a fake
they ask you if they can be on the tam
Nope
you recruit him by going to electric plateau
mission recruit or egg
yes in the final mase
you can't, unless you find a job-request with magikarp as a client. It's recruitable in blue rescue team at the same place as feebas .
In Blue Rescue Team, you can recruit Magikarp in the dungeon Waterfall Pond, 7F-11F.
No, there isn't.
in the second cave