A Pokemon villain know from stealing people's pokemon because they say that they will release them even thought they get rid of the pokemon if no one picks them up and steals it again if they get the pokemon back, they are seem all around the region and you the player must try to defeat them. Their concept is similar to team rocket, but trust me they are worse
Lass Sofia: *Goes for a short stroll with her Eevee*
Team Peta grunt: YOU ARE MISSTREATTING THE POKEMON NOW HE IS MY PROPERTY!
Lass Sofia: Holy defecate he stole my Eevee with perfect ivs and evs! What I am going to do now?
Player: *staring silently*
Lass Sofia: Please help me! I can't live without my Eevee!
Player:
YES
-------> NO, BUT SHE TAKES IT AS A YES AND THE PLOT CONTINUES
Lass Sofia: Thank god you accepted it! Now please go take out the Team Peta