In order to unlock the slots for all 4 pitch Trophies, you need to complete 'Unlock VIP Trophies' in 'Stadium Development III' of 'Milestones' Objects. Stadium Development I and II must be completed to access III. Unlock VIP Trophies requires you to score from a 'Bicycle Kick' in Squad Battles (on World Class difficulty or above) or in Division Rivals (online).
Flair shots are performed by holding L2 + O. It appears that only an overhead kick, a jumping kick with the player underneath the ball and player's back toward the goal, will count (no scissor or scorpion kicks). Unfortunately, you cannot control what type of flair shot your player will attempt, and they are often missed or blocked, even by low-rated defenders and goalkeepers. Players with good Shooting and the Flair Trait are recommended. I personally had the most Bicycle Kick attempts from corner kicks, and occasionally from L1 + Square crosses, although they take so long to reach their target that they are often intercepted or caught. I eventually got a goal from a near-post corner kick with 'Adidas Numbers Up' Dele Alli, against a mostly Silver team in a World Class difficulty Squad Battle after nearly 10 matches. Have also done it recently with standard Heung Min Song.
You must then do as the trophy states: Equip four *different* pitch trophies (you will likely have 4 already if you've gotten this far, otherwise check Milestone Objectives) and win a game in Division Rivals (any Division). It has been said that you need to win a home game, as in a match in your stadium, but a friend got his trophy in an away match in Co-Op, so it doesn't seem to matter. Any win in Rivals should do.