you use a old rod anywhere
in route 201
you cant.you have to have Pokemon perl or action replay
use an old rod in the water your bound to find one
No magicarp can not stop evolving without cheats or hacks
it is magicarp ;)
Shiny pokemon are found in random throughout the game. There is no solid way to get one.
Go to a place where there are wild Magicarp and just keep looking until a shiny Magicarp comes. There is a 1 in 8,192 chance in finding a shiny pokemon.
You need to get an item from an event.
after you defeat the Rapardos @ Perl cave
magicarp ftw
magicarp
magicarp, no dout