I'd say Dive Ball.
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Dive ball.
no you could only get dive ball,pokeball,ultra ball,master ball,luxury ball,heal ball,and more
you just need to have the HM dive give it to a water type pokemon that can use it go to undella bay and use over a black spot and you see what it looks like under the water BTW-you dont do much ,it just shows you what it looks like.
The HM Dive is not in SoulSilver or HeartGold, for there is no deep water to dive into.
You have to go to Undella and get the HM dive. Then you can dive (: