There's a whole thread just for team bonuses. Key points:
You need 4 defenders to train Defense (GK, DL, DC, DR, DMC)
You need 4 midfielders to train Possession (DMC, ML, MC, AML/AMC/AMR)
You need 4 attackers to train Attack (ML/MC/MR, AML/AMC/AMR, ST)
You need 8 players to train Condition (any)
Simplest is having 8 low-level scrubs that cover the 4 defender, midfielder, and attacker spots (DMC is defender and midfield, AMC is midfield and attacker etc).
https://forum.topeleven.com/top-elev...g-contest.html