You can trade your 3 duplicate copies of a carryover player to obtain 1 base ball of the same rarity.
The trading of duplicate players will exist in PES 2020 mobile, but you should remember this simple information. A look of player presentation animation in PES mobile Trading in PES 2020 Mobile They not only become fully maxed players in PES 2020 but also you can get enough GP and training XP using them.
If u didn’t have a chance to play a fully maxed team in PES 2019, you can grab that chance by just training your players to level 31.