Okay, I understand. But I think you should check Community Mode, and see if it can be done in the tournament mode of Community Mode. You can assign teams to the CPU here.
Nope. It's not possible in community mode, which is an area it should be available if the developers are trying to stop people getting cheap unlocks/trophies. It's not possible in any mode, except, and I discovered this by accident, if you set up a friendly against the CPU, it's possible for another player to move the joypad to play as the CPU in the player settings screen when the match is paused, this is what we want to be able to do in all other offline modes, but it's not possible to move the joypad over.
Also, I have won the Champions League, and there was no unlockable players unlocked, nor any specific PS3 trophies won for doing this, so I can't see why it's not available at least in this mode, or in the Community Mode.
I play on top player, and I don't care for PS3 trophies. I'm not in the slightest bit interested in cheating, like everyone else who wants to play PES this way, so for us it has nothing whatsoever to do with cheating. It's about wanting to have a great PES buzz with some mates.
This option was always, and still is available on the PS2 versions of PES. This simple but brilliantly fun feature is something that was in the game, that they have removed from the next gen and PC versions, and it does our heads in that we can't play PES like this
EDIT: I know you can assign teams to the CPU in Community Mode, but you can also assign extra players in other modes. If you mean to pick all the teams that are in the competition so we can play as all our mates opposition teams, well that's possible, but totally unreasonable, for example, picking every team in a Champioins League would mean playing 125 matches to get through it! Way more hassle than being simply being able to move a joypad over in the Player Settings Screen! As for wanting to play say a Spanish League with a couple of mates, well that would mean having to play literally several thousand matches