Yes, these are considered legal basic lands and can be used in any sanctioned tournament format such as Standard, Modern, Legacy, or Commander
Pokmon TCG - Darkrai & Cresselia LEGEND HG & SS Triumphant Cards The LEGEND cards from HeartGold and SoulSilver are another unique concept much like the aforementioned Break cards
This means: Sets OP-01 through OP-08 are not legal in official tournaments
Starting tomorrow, August 16th, Pokemon fans will be able to purchase McDonalds Happy Meals that contain a brand new Match Battle game that comes with a Pokemon Trading Card Game pack with 4 cards, a spinner, and a Pokemon-themed coin
Indeed, most of these characters revealed on the box have also been revealed via the Lorecast that announced the new set (Im sure thats not a coincidence)
If the target permanent is an illegal target as Mental Modulation tries to resolve, it won't resolve and none of its effects will happen