Arbok can be found in the Great Marsh. Make sure you have a Pokemon Fire Red game inserted as well.
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you cant ,for some reason or another, you have to get Pokemon platinum and find it in the great marsh
You have to use the pokeradar which you get once you have completed the Sinnoh pokedex and use it everywhere there is grass sooner or later you will find it. Or you can get an action replay and use the Pokemon modifier code and choose Arbok and catch him.
spell arbok backwards and it spells kobra that's what arbok is do the same with ekans and obviously you will find its a snake
Poison.
breed an electabuzz if you want an elekid in Pokemon platinum