Well, it's not news that the folks here have some really hard time trying to play Final Fantasy Tactics Advance via Link.
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On VBA Link 1.8.0 beta 3 (and confirmed also with the VBA-M 1030b), you can trade items and people, but a battle via link is quite unavailable, as you get to break the Link after the first movement (or a Totema summon, which I did when I was testing the Link).
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A while ago, I got to know that FFTA's Link system is quite different from other games. Maybe that problem could be worked around to turn battles via Link possible?