The final form of Treeko, Sceptile, is cutting into the scene in Pokkén Tournament for Arcade and Wii U. The grass type starting Pokémon has its Mega form as well as a whole host of other moves and abilites. Check out the Japanese reveal trailer to see some gameplay of #254 in action.
Pokkén Tournament is being developed by the Tekken development team and will be out on the Wii U in 2016.