Kangaskhanite

If held by a Kangaskhan (or is present in the player's Bag)^PE, allows it to Mega Evolve into Mega Kangaskhan if its Trainer has a Key Stone. Each Trainer can only Mega Evolve one Pokémon per battle.

Unaffected by item negating effects (such as Embargo and Klutz). Item manipulating effects (such as Trick and Fling) cannot give Kangaskhan a Kangaskhanite or remove a Kangaskhanite from Kangaskhan.

If held by a Kangaskhan, allows it to Mega Evolve into Mega Kangaskhan when it performs a Spectacular Talent during a Pokémon Contest Spectacular while its Trainer has a Key Stone. Kangaskhan will remain a Mega Kangaskhan until the Talent Round ends.

In Pokémon Shuffle, the Kangaskhanite allows the player to Mega Evolve Kangaskhan.

The player can obtain the Kangaskhanite by defeating Mega Kangaskhan in Stage 20 found on Sandy Bazaar.

The Kangaskhanite enables the following Mega Evolution:

Stone	Pokémon			Type	Effect	Gauge	Max
			Mega Kangaskhan	Normal	Erases all Pokémon in the five columns to the left and right.	11	8

In They Have a Flare for a Li'l Kanga-Napping, X's Kangaskhan, Kanga, was revealed to have a Kangaskhanite within her pouch, explaining how her baby, Li'l Kanga, had been able to Mega Evolve earlier.