Where is oakheart in wizard101?

Answer 1

Oakheart is in Mooshu. He is a series of side quests that lead up to a final quest in a dungeon. If you are not in Mooshu as a curent world, you may not start Oakheart quests. In order to receive the life level 58 spell you must complete these quests.

Answer 2

Oakheart is located in Unicorn Way, in the area called Hedge Maze. You can find him near the entrance to the Hedge Maze, to the left as you enter from the Commons. Oakheart is part of a quest called "Defeat Oakheart" where you need to defeat him as part of the Unicorn Way storyline.