As far as i know, there isn't one in ruby/sapphire/emerald. The closest you can get is the match call function of your pokenav.
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There is no vs. seeker on sapphire pokemon. there is something on the pokenav called trainers eyes. trainers eyes = vs. seeker
Don't ask me how to. I think you can't get it
there is no vs. seeker in the originals there is no vs. seeker in the originals
There is np VS. Seeker in Pokemon Crystal.
But you do not get the vs seeker in blue red and yellow I've tried many times and none of them gave me anything so i was like what is this i want a vs seeker so i went online and found out that there are no vs seeker