Go into the Tanzan Mountain, and go to the right.

After going that way and up into a tunnel go right, you should see an entrance covered in rocks and a hole on the wall to the right of the entrance go through the hole, and down the stairway into the Tanzan Mountain Depths, go right, go up, go left, go down and you will reach an area where you need Flash to see better continue on, you will pass a Healing Machine that you can use if you want and into another area in this one you should see a Seviper at the end of it, interact with it to battle it, the Seviper will be Lvl 45.
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