Yes I am posting yet again on this topic. upon re-reading your post Deneb, I realized you wanted help on using techniques. I'm guessing you mean wither tackle and stuff like that.
First you have to get/learn them. You get them by assigning marks/assigning a player for each of your players. You can assign by stats or by technique learning only. Say you're trying to set a mark for Tidus and you want Tidus to learn a technique. On the "set mark" screen, click on Tidus then scroll through the oppossing team members, looking on the bottom for any BLUE technique that comes up. That means that Tidus can learn this technique. So click on that person whose technique you want to learn.
During gameplay, the mode has to be set to "Mark Mode" Then watch the player Tidus is marked with/guarding and when that player does his technique, a "Technocopy!" will flash on the screen for a second. If you're learning a tackle or pass move, press "X" as soon as you see the "Technocopy!" If you're learning a shot technique, press "x" just before your mark kicks the ball.
Your player has to be at least on level 2 or 3 to learn a technique. When you reach that level, you get a blank line, which means you can have one technique.
Hope that helps.
And for Seymour, I had Lulu learn Bio and casted it on him right away, before Seymour casts reflect on himself. That way, every turn he takes, Seymour loses like 1500 or 2000 HP. Use Rikku's Overdrive Mix and mix Trio 9999. Then have Tidus use slice and dice or even better, Blitz ace if you have it. Or you can use Lulu's overdrive Fury as that can do up to 9 hits.
If you don't have the ingredients to make trio 9999, you can just use all of your aeons. Make sure they all have their Overdrives full and use them right off the bat cause Seymour banishes them after one turn.
