Venusaurite (quest)

The Venusaurite quest is the questline done in order to acquire the Mega stone for Venusaur―the Venusaurite.

Instructional Walkthrough

To begin the quest, go to Pallet Town and speak with Professor Oak in his lab. Contingent on having the Mega Bracelet, Oak will give you the chance to start the quest for any of the Kanto starter Mega stone. He will ask that you bring him either a Bulbasaur, Charmander, or Squirtle.

Obviously for this quest you want to bring him a Bulbasaur, but not just any Bulbasaur will do. You need to bring a Bulbasaur with at least 90 total IVs and either a Bold, Calm, Modest, or Sassy nature. Do note that the Bulbasaur does not need to have your OT, but it does need to be caught after you’ve spoken with Oak.

Once you’ve obtained a Bulbasaur that meets all the requirements, return to Oak and show it to him. After gaining Oak’s approval, you must now train your Bulbasaur to prepare it for a tough battle ahead. You will need to EV train it, level it up to level 100, and fully evolve it.

After training has finished, return to Oak and show him your newly evolved Venusaur. He will ask if you are ready for battle, and after accepting it, the battle will begin.

Professor Oak’s Lineup
Blastoise Nature Ability Item Random Random None Move Type Category Base Power Accuracy Dark Pulse Dark Special 80 100	Venusaur Nature Ability Item Random Random None Move Type Category Base Power Accuracy Sludge Bomb Poison Special 90 100 [[]] — [[]] — [[]] —
Mega Charizard Y Nature Ability Item Random Solar Power None Move Type Category Base Power Accuracy Flame Charge Fire Physical 50 100
Emboldened moves avail from a STAB bonus when deployed by that Pokémon. Italicized moves are functionally broken; see their individualized pages for more information.

Upon defeating Oak, he will reward you with the Venusaurite and you can now begin either the Blastoisite (quest) or the Charizardite Y (quest).