You use them to peg the net in place to catch the gift shop when the balloons burst. :D
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You get the net from the light house and get the balloons as well. (ask the person who is tying the balloons if you can have some.) Then put the balloon on the side of the front of the gift shop, (Make sure you have the pump and blow up a balloon.) then, it will pop. talk to the guy with the barrels in the lighthouse and get a barrel. shake it up and put it under the gift shop. then go to the tunnel and put the net there, then use the tent pegs from the sports shop, and the hammer from the gadget room to hold the shop up.
in front of bill's moms house and beside the purpule tent at the top of the city(goldenrod)
You can marry Marlin, the guy who lives with Vesta and Celia on the far East Side of town. Marlin's diary is in Vesta's house by the "tomatoe brochure" on the bench beside the beds. Also you can marry Gustafa, they one who lives in the colourful tent by the ocean shore. Gastafa's diary is inside the tent (also known as a yurt) on the couch beside his little guitar. The third bachelor you can marry is Rock, Tim and Ruby's son at the Inner Inn. Rock's diary is in the room upstairs to the right beside his closet.
The green tent, as far as I know, does not exist. But there is a Blue Tent and Red Tent, received from the Trick Master after completing his final maze. Sorry!
Go to a Heart Scale move Tutor and give him a heart scale. In Emerald he's in the house beside the Battle Tent. In HG/SS, he's the guy standing closest to the table, in the house in the south-west corner of BlachThorn City. And in Platinum, he's in the house right beside a large body of water, on the south east side of Pastoria City.