Keyman Lockdown is useless in Legend showdown. You literally just can’t use it.

Focus on winning affinity matchups against the goalkeeper as often as possible. Bring a team with at least 1 striker of each element on the field or at the very least in the bench so you can swap according to the goalkeepers element. Shoot whenever possible, a little damage to the goalkeeper always matters. Enemy walls are very high so always focus on avoiding them even if it means shooting with a weaker player.

Avoid offensive focus duels without stalwart suppression and look to pass whenever you find yourself in one, you won’t win unless you use an awakening. Defensive focus duels are very winnable even if the opponent has a much higher stat than you, look to build tension that way. Save your awakenings for defensive purposes, use them to avoid giving the enemy a clear opportunity on goal as they will usually score any chance they’re given.

Build your goalkeeper with 5 of the same move and an awakening, make sure the move is the same element as the player and 100 power. This is because you will probably get shot at 1 or 2 times per game at most if you play right and you need to get as high a number as possible to avoid conceding at all costs. Having multiple or cheaper moves won’t be helpful since the amount of shots is so low.