Technically, as soon as you enter the water you are diving. Just use the arrow keys to move around in the water.
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run under him when he jumps, then dive (down arrow) for his tail. then press right and left repeatedly. There is a Super Mario 63.
There is no Super Mario 63. But if there was, I'm sure it wouldn't have web browsers in it. But even if it did, I'm sure said web browsers wouldn't have tails.
Just jump and then press down (or dive) after that press left and right repeatedly
Dive on his tail and then press left right left right left right many times.
There's no such thing as shine sprite groups in Super Mario 63.