what is the difference between trainers?
 

what is the difference between different number trainers
thx in advance

Well the numbers corresponds to the number of options on the trainer

+6 has 6 options

+2 has 2

and so on


Unless you mean the version number which corresponds to the version of the game.

What is the purpose of the trainer?

Its to train you to become better at a game.

Although some will abuse it and use it from start to finish and think they are cool :P