I have these egg move pokemon to trade for your EVed magmotar:
Adamant bagon w/ DD
Adamant elekid w/ fire punch, ice punch and cross chop
Careful mudkip w/curse
jolly sneasel w/ ice punch and brick break
calm chikorita w/ grasswhistle and leech seed
bold feebas w/ hypnosis
adamant totodile w/ DD, ice punch and crunch
You may pick 3 if you wish. They're not nicknamed.
EDIT: sorry didnt read exactly whats going on. I have an EV trained rapidash (note its has the effort ribbon) and it is shiny too.
the possible EV spreads are:
252atk 252 spd. (im not really sure whats the ev spread but this is the best I can do.)
Its adamant nature.