If you want to make your pokémon less friendly, you should battle and let it faint. Another way to make it less friendly quickly is to give it Revival Herb.
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The massage girl is in Veilstone. Her massages make your Pokemon more friendly, and get you Pokemon accessories! Hope this helps!!!!!!!!!
Use items like Carbos, Calcium, Zinc, Protien bought from the department store in veilstone city
make friendly at night by rare candy of other items. worked 4 me, works 4 u
It is a special pokeball that has a catch rate between a pokeball's and a great ball's. If you catch a pokemon with a luxury ball, the pokemon will grow friendly to you much faster than normal. This is good because there are several pokemon that will only evolve if they like you a TON. Some of these are Munchlax, Togepi and Golbat
you deposit some of your items at the computer or use some of them or just toss it away