I'm not 100% sure what you mean.
If you want to display attacks, use pictures. It means making a pic of every attack name. It's horribly long to do, but worth it rather then doing the choice system.
If you want the pokemon to use the move, what you do is, have 5 variables. Well 4 for each pokemon (attack slot1, attack slot 2 and so on)- then have a variable called "move selected"- set the value of the "move selected" equal to the attack value the player picks.
Then have conditional branches for the attacks all under the move selected variable. Again it will mean like- 400 conditional branches- but there is no other way if you want it to look right.