4th Gen EV Training

I completed the Pokedex in Omega Ruby and have a little over 3 boxes full of Perfect IV, Ev trained Pokemon. Another headache gone. Now it's time to goof off and have fun in Platinum, a game I recently picked back up. I'm not going for perfect IVs but I'm gonna get a good nature and EV train these Pokemon.

I started EV training in black and white, so I'm a little lost on where to start in Platinum. Any tips? Anywhere I should use the Vs Seeker and train for the most EVs? The most experience? The most cash? I remember an old couple oustide of the Pokemon Mansion that was great for a bunch of money. Any tips guys?

Hey, I'm on Pearl(this is my first time EV training) and I started EV training right away with a couple pokemon(not including my starter) but going further into the game I ruined the training. So I waited till I could breed and started with gentle female Chansey with Serene Grace.

HP & SP.ATK are what I'm training for, I want most of the value points to go towards HP. I started with SP.ATK and defeated Psyducks and Golducks. Cannot remember the route i was on and I've now moved on to Route 205 fighting Shellos. The Shellos are on low levels however I don't mind cause I gain more EV's faster and I'm still gaining levels fairly fast, plus I've already found a Shiny Shello. I was hoping to find a shiny since I've been on this route for the last few days haha. (=