I don't think you will be able to outrun max speed timid kingdra unless it's a more bulkier spread, but I think 252 speed adamant is necessary, since you get that small speed drop. Don't change it.
Thanks for the input, I should have never said kingdra it was a bad example I have prankster thunder wave to deal with him. I want to up my garchomps hp evs to give him a little more bulk not by much but by some at least. I never really felt 252 252 and 4 were ever the way to go for evs on anything.