Forum Thread
Mega Evolve
Forum-Index → Help → Answered → Mega EvolveIf not, then your tyranitar cannot mega evolve.
If it does, then you need to wait for it to level up before it mega evolves.
Once you get a mega-powered Pokemon (one with the ability to mega evolve), give it the Mega Stone to hold. At level 50, it will mega evolve. This will use up the Mega Stone, so you won't have one anymore. Mega evolution is a permanent evolution, like a regular one. It's not temporary like it is in the normal games.
It's for this reason that shiny mega evolved Pokemon are so rare and valuable. It takes a long time to hunt them (usually) because you not only have to hatch a shiny Pokemon, but you have to hatch one that can mega evolve as well. The Ranklist shows some of the dedicated shiny mega hunters!
If you have any other questions, feel free to PalPad me :)