Find Blue, Green, Red, and Yellow Shards. These may be found near Mossdeep, under the water. Go to the Hunter's House. Trade him Blue Shards for Water Stones, Green Shards for Leaf Stones, Red Shards for Fire Stones, and Yellow Shards for Thunder Stones.
Go to Slateport City. Talk to the Chairman in the Pokémon Fan Club. If your lead Pokémon has maximum coolness, he will give you a Red Scarf. If your lead Pokémon has maximum beauty, he will give you a Blue Scarf. If your lead Pokémon has maximum cuteness, he will give you a Pink Scarf. If your lead Pokémon has maximum smartness, he will give you a Green Scarf. If your lead Pokémon has maximum toughness, he will give you a Yellow Scarf.
Every time you encounter a pokemon you have a 1/8192 chance of the pokemon being a different color, this is called a shiny pokemon
when you put a pokemon in a day care center, each step you take equals one exp. point. if you want to level up a pokemon faster while it is in the center, you must first obtain the acro bike from rydel. then fly over to lavaridge town and bike all the way right until you reach the desert. bike over to the mudslide and face it. now here is the tricky part, find a way to hold down the UP button on your gameboy. leave it on overnight, and your set. this may not work as well for people without an sp.
If you have the Acro Bike equipped, get on it while you're in the Safari zone. If you hop up and down in one spot of grass, you can run into Pokemon without using up steps.
Win at least 50 battles in a row in the Battle Tower. You will receive the Silver Trophy. Win at least 100 battles in a row in the Battle Tower. You will receive the Gold Trophy. Get 5 pictures painted in the Lilycove Art Museum. You will receive the Glass Sculpture.