How do you assist target with a controller in FFXIV?

Solution 1:

Ha! Found a way!

Go to the System configuration menu > Gamepad settings and start Button configuration:

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Then, select any button to bind Assist target, for example, Right Thumb-click:

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As far as I know, there currently isn't a button mapping to assist-target directly via controller.

However, the same can be accomplished via a macro, which can then be assigned to your cross hotbar:

/assist (or /as) will assist your current target.
/assist "Player Name" (or /as "Player Name") will assist a player by name.
/assist <2> (or /as <2>) will assist the party member in party slot 2. (Useful if you tend to re-order your party list to put, say, the main tank in a specific slot.) You can change the number to any other slot, as well.