If you mean in-game, then just change the settings from "set" to "shift" in the options. For any sort of link battles or frontier challenges, you're forced to be on set because that would sort of be cheating. Someone can easily switch out to a Pokemon with an advantage every time they knock out an opponent's Pokemon.
you use the vs. seeker and trainers will ask you to battle you.
Pokemon trainers don't know for sure.
i don't know but sertch on Pokemon cheats.com
You can't steal Pokemon however in Pokemon colosseum and Pokemon xd gale of darkness you can snag shadow Pokemon from trainers.
to get data on Pokemon in your pokedex, capture the Pokemon unless they are trainers Pokemon then you have to cheat to get trainers Pokemon.
No trainers will have articuno.
Pokemon and pokeballs
there isn't one that i know of
No
If you want to battle Palmer,you need to battle 21 trainers If you want to beat Thorton,you need to battle also,21 trainers If you want to battle Dahilia,battle 21 trainers(also!) If you want to battle Darach ad Lady Caithlin,battle 21 trainers But if you want to battle the battle hall brain,(do not know the name) you will need to battle 51 Pokemon (not trainers)each trainer has 1 Pokemon. Hope I helped!
you need two batteries double a batteries at the side of your game boy colour then trow a pokemon ball at the trainers pokemon
trainers don't hold them get a Pokemon that has the ability pick up like meowth or zigagooon