Where do I use my vs.seeker to train before E4 platinum?

Question

Title says it all :)
P.S If anyone can help below, I'd be really thankful!
http://pokemondb.net/pokebase/rmt/29238/help-with-my-platinum-team

Answer 1

Route 223 - Road right before the Elite Four, Level 40-60 Pokemon. Trainer List here.
Route 222 - Road right before Sunyshore City, Level 45-61 Pokemon. Trainer List here.
Route 221 - Road right next to Pal Park, level 34-56 Pokemon. Trainer List here.

These routes should suffice for Elite Four training.

Comments

Sloooow

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*sonic voice* YOOOOUUU'RRREEEE TOOOO SSSSLLLOOOOWW!!!

Answer 2

Check here for an entire list of every trainer that will have a rematch with you. You probably want to scroll down the heading that says "Level 41-50" and look under that and all the headings below it. It's a lot to write, so I hope you're OK with a link.