get the TM surf and waterfall and youll pass it
No! All you need to do is keep going down until you see a light.
Union Cave
Go to the Union Room.
You find it in Union Cave.
You can trade Pokemon in the union room, the basement, and even in Goldenrodcity at the GTS place.
Yeah, if you mean the WiFi battle in the Union Room.
walk?? look around!!
B1F of the Union Cave on Friday.
Go to the union room on the second floor of the pokemon center, or trade over wifi.
It is upstairs of the Pokemon center the first person to your left
no, only the link trade and poketransfer will work
Talk to the fisherman NPC in the Pokemon center near the entrance to Union Cave.