Latios ways a few more pounds making it easier to catch with the Heavy Ball. Also, Latios has 20 more Base Sp. Attack than Latias (130 in total), whereas Latias has 20 more Base Sp. Defense than Latios(130 in Total)
A comparison from Psypokes:
Latias
HP80ATK80DEF90SA110SD130SPD110
Latios
HP80ATK90DEF80SA130SD110SPD110
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there is no vs. seeker in the originals there is no vs. seeker in the originals
There is np VS. Seeker in Pokemon Crystal.
There is no vs. seeker on sapphire pokemon. there is something on the pokenav called trainers eyes. trainers eyes = vs. seeker
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