You cant
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you use the purify chamber by putting Pokemon in it and when the choas (or purple thing goes down) it will purifie your Pokemon
You can't because time flutes are used to purify Pokemon in colosseum.
level 100 or he will own you instantly if you have a grass type your dead
The Persim berry, if the Persim berry is give to a pokemon and it becomes confused it will instantly snap out of it's confusion hope it helps!
No if you want one you will need to trade a dratini from firered or leafgreen to sapphire then train it to level 55 OR purify the shadow dragonite in Pokemon xd gale of darkness then trade it to sapphire.